Bibliographies thématiques / Strong Electron Correlation Effect

Littérature scientifique sur le sujet « Strong Electron Correlation Effect »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Strong Electron Correlation Effect"

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BOERI, LILIA, EMMANUELE CAPPELLUTI, CLAUDIO GRIMALDI et LUCIANO PIETRONERO. « EFFECT OF STRONG CORRELATION ON THE ELECTRON-PHONON INTERACTION ». International Journal of Modern Physics B 14, no 25n27 (30 octobre 2000) : 2970–75. http://dx.doi.org/10.1142/s0217979200003186.

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High-T c superconductors are usually described as strongly correlated electronic systems. This feature deeply affects the one-particle and two-particle properties of the system. In particular, a large incoherent background developes on the top of a narrow quasi-particle peak in the one-electron spectral function. We schematize this structure with a simple phenomenological form. The corresponding Green's function is employed to calculate the charge response of the system taking into account in a proper way strong correlation effects. The effective charge interaction acquires a structure in the exchanged momentum space with a predominance of forward scattering, in agreement with previous numerical calculations. The consequences of the momentum dependence of the interaction are discussed in the framework of the nonadiabatic theory of superconductivity proposed for the high-T c materials.
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Song, Weiyu, Jing Wang, Jian Meng et Zhijian Wu. « Strong electron correlation effect of Ru 4d electrons in La2NiRuO6 and La2ZnRuO6 ». Chemical Physics Letters 486, no 1-3 (février 2010) : 27–31. http://dx.doi.org/10.1016/j.cplett.2009.12.070.

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Nagaoka, Yosuke. « The Kondo Effect : from Resistance Minimum to Strong Electron Correlation ». JPSJ News and Comments 2 (14 janvier 2005) : 01. http://dx.doi.org/10.7566/jpsjnc.2.01.

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Egami, T., S. Ishihara et M. Tachiki. « Lattice Effect of Strong Electron Correlation : Implication for Ferroelectricity and Superconductivity ». Science 261, no 5126 (3 septembre 1993) : 1307–10. http://dx.doi.org/10.1126/science.261.5126.1307.

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ZHANG, JIAN, et P. LAMBROPOULOS. « NONPERTURBATIVE TIME-DEPENDENT THEORY OF TWO-ELECTRON ATOMS IN STRONG LASER FIELDS ». Journal of Nonlinear Optical Physics & ; Materials 04, no 03 (juillet 1995) : 633–46. http://dx.doi.org/10.1142/s0218863595000276.

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This work deals with the fundamental problem of the behavior of the two-electron atom under intense laser fields. We present a broad scope of calculations and results and, we believe, the first ATI spectrum, in He and Mg atom, beyond the single active electron model in a fully time-dependent nonperturbative calculation. For He, we perform calculations both on a two-electron basis with configuration interaction where both electrons are allowed to be excited, and on a frozen core basis. The comparison is a direct measure of the effect of correlation under strong fields. The results for Mg shows that the method also opens a way to the study of atoms with much stronger electron correlation in intense laser fields.
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CAPONE, M. « INTERPLAY OF STRONG CORRELATION AND JAHN-TELLER EFFECT IN ORBITALLY DEGENERATE SYSTEMS ». International Journal of Modern Physics B 14, no 29n31 (20 décembre 2000) : 3380–85. http://dx.doi.org/10.1142/s021797920000385x.

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We study the unconventional insulating state in A 4 C 60 by means of the dynamical mean-field theory. The interplay between the electron-electron correlation and the Jahn-Teller interaction determines the properties of these compounds. The system is a Mott-Jahn-Teller insulator. In that state, conduction between molecules is blocked by on-site Coulomb repulsion, magnetism is suppressed by intra-molecular Jahn-Teller effect, and important excitations (such as optical and spin gap) are found to be essentially intra-molecular. Experimental values of the optical and spin gaps are recovered by our calculations.
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Mazziotti, David A. « Effect of strong electron correlation on the efficiency of photosynthetic light harvesting ». Journal of Chemical Physics 137, no 7 (21 août 2012) : 074117. http://dx.doi.org/10.1063/1.4746244.

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Rozenberg, M. J., I. H. Inoue et M. J. Sánchez. « Strong electron correlation effects in nonvolatile electronic memory devices ». Applied Physics Letters 88, no 3 (16 janvier 2006) : 033510. http://dx.doi.org/10.1063/1.2164917.

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Das, Tanmoy, R. S. Markiewicz et A. Bansil. « Strong correlation effects and optical conductivity in electron-doped cuprates ». EPL (Europhysics Letters) 96, no 2 (1 octobre 2011) : 27004. http://dx.doi.org/10.1209/0295-5075/96/27004.

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Zakrzewski, Viatcheslav G., Olga Dolgounitcheva et J. V. Ortiz. « Strong correlation effects in the electron binding energies of phthalocyanine ». International Journal of Quantum Chemistry 109, no 15 (30 juillet 2009) : 3619–25. http://dx.doi.org/10.1002/qua.22360.

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Thèses sur le sujet "Strong Electron Correlation Effect"

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Marcotte, Étienne. « First principles theory for quantum transport : effects of strong correlation ». Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116102.

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In this work, we investigate effects of strong correlation to quantum transport from atomic first principles. In order to accomplish this task, we use a well established state-of-the-art formalism of quantum transport where density functional theory (DFT) is carried out within the Keldysh non-equilibrium Green's functions (NEGF). To deal with certain strong correlation phenomenon, we integrated an local density approximation plus Hubbard U (LDA+U) exchange-correlation potential into the existing NEGF-DFT formalism. The LDA+U potential correctly accounts for the electronic structure of correlated material. We will present the theory and numerical implementation associated with the NEGF-DFT-(LDA+U) in detail. Extensive tests on the well known correlated material FeO crystal have been carried out and results compared with previous literature as well as to experimental data.
We then apply our NEGF-DFT-(LDA+U) technique to investigate transport physics of spin resolved tunnelling in Fe/MgO/Fe magnetic tunnel junctions (MTJ). We found that interfacial oxygen atoms are enough to localise the 3d electrons of infacial Fe atoms due to strong correlation. This surprising result substantially changes quantum transport properties of the MTJ, in particular it reduces magnetic resistance ratio by about 33%. This strongly correlated physics is absent if the conventional local spin density approximation (LSDA) is used in the NEGF-DFT analysis. Results of LSDA and LDA+ U exchange-correlation potential will be compared. Furthermore, through investigating contributions to scattering states by various atomic orbitals, we clearly identify the reason why LDA+U changes quantum transport in both quantitative and qualitative ways. Finally, we believe this strongly correlated physics should be general in other MTJs involving different oxides.
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Gruenewald, John H. « TUNING THE EFFECTIVE ELECTRON CORRELATION IN IRIDATE SYSTEMS FEATURING STRONG SPIN-ORBIT INTERACTION ». UKnowledge, 2017. https://uknowledge.uky.edu/physastron_etds/51.

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The 5d transition metal oxides have drawn substantial interest for predictions of being suitable candidates for hosting exotic electronic and magnetic states, including unconventional superconductors, magnetic skyrmions, topological insulators, and Weyl semimetals. In addition to the electron-electron correlation notable in high-temperature 3d transition metal superconductors, the 5d oxides contain a large spin-orbit interaction term in their ground state, which is largely responsible for the intricate phase diagram of these materials. Iridates, or compounds containing 5d iridium bonded with oxygen, are of particular interest for their spin-orbit split Jeff = 1/2 state, which is partially filled without the presence of any additional electron correlation. However, the comparable energetics between a small, finite electron correlation energy and the spin-orbit interaction make the band structure of iridates amenable to small perturbations of the crystalline lattice and ideal for exploring the interplay between these two interactions. While altering the spin-orbit interaction strength of iridium is tenably not feasible, the electron correlation energy can be tuned using a variety of experimental techniques. In this dissertation, the electronic and magnetic properties of iridates at various electron correlation energies are studied by altering the epitaxial lattice strain, dimensionality, and the radius size of the A-site cation. These parameters tune the effective electronic bandwidth of the system, which is inversely proportional to the effective electron correlation energy. The lattice strain and the cationic radius size achieve this by altering the Ir-O-Ir bond angle between nearest neighbor Ir ions. In the case of dimensionality tuning, the effective bandwidth is controlled via the coordination number of each Ir ion. In the first study, a metal-to-insulator transition is observed in thin films of the semi-metallic SrIrO3 as in-plane compressive lattice strain is increased. This observation is consistent with the expectation of compressive lattice strain increasing the effective correlation energy; however, optical spectroscopy spectra reveal the increase is not sufficient for opening an insulating Mott gap. In the second part, the effective correlation energy is adjusted using a dimensional confinement of the layered iridate Sr2IrO4. Here, the coordination number of each Ir ion is reduced using an a-axis oriented superlattice of one-dimensional IrO2 quantum stripes, where several emergent features are revealed in its insulating Jeff = 1/2 state. In the final study, the effective correlation is tuned in a series of mixed-phase pyrochlore iridate thin films, where the Ir atoms take a corner-shared tetrahedral configuration. Here, a transition between conducting to insulating magnetic domain walls is revealed as the correlation energy is increased via A-site chemical doping. Each of these studies sheds light on the pronounced role the effective correlation energy plays in determining the local subset of phases predicted for iridates and related systems featuring strong spin-orbit interactions.
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Paerschke, Ekaterina. « Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235245.

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In the last decade, a large number of studies have been devoted to the peculiarities of correlated physics found in the quasi-two-dimensional square lattice iridium oxides. It was shown that this 5d family of transition metal oxides has strong structural and electronic similarities to the famous 3d family of copper oxides. Moreover, a delicate interplay of on-site spin-orbit coupling, Coulomb repulsion and crystalline electric field interactions is expected to drive various exotic quantum states. Many theoretical proposals were made in the last decade including the prediction of possible superconductivity in square-lattice iridates emerging as a sister system to high-Tc cuprates, which however met only limited experimental confirmation. One can, therefore, raise a general question: To what extent is the low-energy physics of the quasi-two-dimensional square-lattice iridium oxides different from other transition metal oxides including cuprates? In this thesis we investigate some of the effects which are usually neglected in studies on iridates, focusing on quasi-two-dimensional square-lattice iridates such as Sr2IrO4 or Ba2IrO4. In particular, we discuss the role of the electron-phonon coupling in the form of Jahn-Teller interaction, electron-hole asymmetry introduced by the strong correlations and some effects of coupling scheme chosen to calculate multiplet structure for materials with strong on-site spin-orbit coupling. Thus, firstly, we study the role of phonons, which is almost always neglected in Sr2IrO4, and discuss the manifestation of Jahn-Teller effect in the recent data obtained on Sr2IrO4 with the help of resonant inelastic x-ray scattering. When strong spin-orbit coupling removes orbital degeneracy, it would at the same time appear to render the Jahn-Teller mechanism ineffective. We show that, while the Jahn-Teller effect does indeed not affect the antiferromagnetically ordered ground state, it leads to distinctive signatures in the spin-orbit exciton. Second, we focus on charge excitations and determine the motion of a charge (hole or electron) added to the Mott insulating, antiferromagnetic ground-state of square-lattice iridates. We show that correlation effects, calculated within the self-consistent Born approximation, render the hole and electron case very different. An added electron forms a spin-polaron, which closely resembles the well-known cuprates, but the situation of a removed electron is far more complex. Many-body configurations form that can be either singlets and triplets, which strongly affects the hole motion. This not only has important ramifications for the interpretation of angle-resolved photoemission spectroscopy and inverse photoemission spectroscopy experiments of square lattice iridates, but also demonstrates that the correlation physics in electron- and hole-doped iridates is fundamentally different. We then discuss the application of this model to the calculation of scanning tunneling spectroscopy data. We show that using scanning tunneling spectroscopy one can directly probe the quasiparticle excitations in Sr2IrO4: ladder spectrum on the positive bias side and multiplet structure of the polaron on the negative bias side. We discuss in detail the ladder spectrum and show its relevance for Sr2IrO4 which is in general described by more complicated extended t-J -like model. Theoretical calculation reveals that on the negative bias side the internal degree of freedom of the charge excitation introduces strong dispersive hopping channels encaving ladder-like features. Finally, we discuss how the choice of the coupling scheme to calculate multiplet structure can affect the theoretical calculation of angle-resolved photoemission spectroscopy and scanning tunnelling spectroscopy spectral functions.
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Brener, Sergej. « Coulomb Drag and Jahn-Teller effect in two-dimensional electron systems in strong magnetic fields ». [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-26345.

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Mori, Toshifumi. « Theoretical Study of Dynamic Electron Correlation Effect on the Free Energy Surfaces for Chemical Reactions in Solution ». 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120690.

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Sato, Yuki. « Quantum oscillations and charge-neutral fermions in Kondo insulator YbB₁₂ ». Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263447.

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Sánchez-Barriga, Jaime. « A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems ». Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2010/4849/.

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This thesis is focused on the electronic, spin-dependent and dynamical properties of thin magnetic systems. Photoemission-related techniques are combined with synchrotron radiation to study the spin-dependent properties of these systems in the energy and time domains. In the first part of this thesis, the strength of electron correlation effects in the spin-dependent electronic structure of ferromagnetic bcc Fe(110) and hcp Co(0001) is investigated by means of spin- and angle-resolved photoemission spectroscopy. The experimental results are compared to theoretical calculations within the three-body scattering approximation and within the dynamical mean-field theory, together with one-step model calculations of the photoemission process. From this comparison it is demonstrated that the present state of the art many-body calculations, although improving the description of correlation effects in Fe and Co, give too small mass renormalizations and scattering rates thus demanding more refined many-body theories including nonlocal fluctuations. In the second part, it is shown in detail monitoring by photoelectron spectroscopy how graphene can be grown by chemical vapour deposition on the transition-metal surfaces Ni(111) and Co(0001) and intercalated by a monoatomic layer of Au. For both systems, a linear E(k) dispersion of massless Dirac fermions is observed in the graphene pi-band in the vicinity of the Fermi energy. Spin-resolved photoemission from the graphene pi-band shows that the ferromagnetic polarization of graphene/Ni(111) and graphene/Co(0001) is negligible and that graphene on Ni(111) is after intercalation of Au spin-orbit split by the Rashba effect. In the last part, a time-resolved x-ray magnetic circular dichroic-photoelectron emission microscopy study of a permalloy platelet comprising three cross-tie domain walls is presented. It is shown how a fast picosecond magnetic response in the precessional motion of the magnetization can be induced by means of a laser-excited photoswitch. From a comparision to micromagnetic calculations it is demonstrated that the relatively high precessional frequency observed in the experiments is directly linked to the nature of the vortex/antivortex dynamics and its response to the magnetic perturbation. This includes the time-dependent reversal of the vortex core polarization, a process which is beyond the limit of detection in the present experiments.
Diese Dissertation beschäftigt sich mit den elektronischen, spinabhängigen und dynamischen Eigenschaften dünner magnetischer Systeme. Auf dem Photoeffekt basierende Untersuchungsmethoden werden zusammen mit Synchrotronstrahlung eingesetzt, um die spinabhängigen Eigenschaften dieser Systeme im Energie- und Zeitbereich zu untersuchen. Im ersten Teil dieser Arbeit wird mit spin- und winkelaufgelöster Photoemission die Stärke von Elektronenkorrelationseffekten in der spinabhängigen elektonischen Struktur von ferromagnetischerm bcc Fe(110) und hcp Co(0001) untersucht. Die experimentellen Ergebnisse werden verglichen mit theoreteischen Berechnungen im Rahmen der Näherung der Drei-Körper-Streuung und der dynamischen Molekularfeldtheorie, zusammen mit Berechnungen des Photoemissionsprozesses im Rahmen des Ein-Stufen-Modells. Ausgehend von diesem Vergleich wird gezeigt, dass die gegenwärtig fortgeschrittensten Rechnung, obgleich sie die Beschreibung von Korrelationseffekten in Fe und Co verbessern, zu kleine Massenrenormalisierungen und Streuraten ergeben, was zu der Forderung nach verfeinerten Vielteilchentheorien unter Einbeziehung von nichtlokalen Fluktuationen führt. Im zweiten Teil wird unter Kontrolle durch die Photoelektronenspektroskopie im Detail gezeigt, wie Graphen durch chemische Gasphasenabscheidung auf den Übergangsmetall-Oberflächen Ni(111) und Co(0001) aufgebracht und mit einer Monolage Au interkaliert werden kann. Für beide Systeme wird eine lineare E(k)-Dispersion masseloser Dirac-Fermionen im Graphen-pi-Band in der Nähe der Fermi-Energie beobachtet. Spinaufgelöste Photoemission des Graphen-pi-Bandes zeigt, dass die ferromagnetische Polarisation von Graphen/Ni(111) und Graphen/Co(0001) vernachlässigbar ist und dass Graphen/Ni(111) nach Interkalation mit Au eine Spin-Bahn-Aufspaltung aufgrund des Rashba-Effekts zeigt. Im letzten Teil wird eine zeitaufgelöste Studie des Röntgenzirkulardichroismus mit Photoelektronenmikroskopie präsentiert, die an einer Permalloy-Probe durchgeführt wurde, die drei als Stachelwände ausgebildete Domänenwände enthält. Es wird gezeigt, wie eine schnelle magnetische Antwort auf der Pikosekundenskala in der Präzessionsbewegung der Magnetisierung durch einen laserangesteuerten Photoschalter erzeugt werden kann. Durch Vergleich mit einer mikromagnetischen Rechnung wird gezeigt, dass die relativ hohe Präzessionsfrequenz, die im Experiment beobachtet wird, in unmittelbarer Beziehung steht zu den Eigenschaften der Vortex/Antivortex-Dynamik und ihrer Antwort auf die magnetische Störung. Das schließt die zeitabhängige Umkehr der Vortexkernpolarisation ein, einem Vorgang der jenseits der Nachweisgrenze der gegenwärtigen Experimente liegt.
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Paerschke, Ekaterina [Verfasser], Jeroen van den [Akademischer Betreuer] Brink, Jeroen/van den [Gutachter] Brink et Krzysztof [Gutachter] Wohlfeld. « Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides / Ekaterina Paerschke ; Gutachter : Jeroen van den Brink, Krzysztof Wohlfeld ; Betreuer : Jeroen van den Brink ». Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1160875170/34.

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Pärschke, Ekaterina [Verfasser], Jeroen van den [Akademischer Betreuer] Brink, Jeroen/van den [Gutachter] Brink et Krzysztof [Gutachter] Wohlfeld. « Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides / Ekaterina Paerschke ; Gutachter : Jeroen van den Brink, Krzysztof Wohlfeld ; Betreuer : Jeroen van den Brink ». Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1160875170/34.

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Yao, Yongxin. « Thermodynamic prediction of glass formation tendency, cluster-in-jellium model for metallic glasses, ab initio tight-binding calculations, and new density functional theory development for systems with strong electron correlation ». [Ames, Iowa : Iowa State University], 2009.

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Livres sur le sujet "Strong Electron Correlation Effect"

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J, Emery V., dir. Correlated electron systems : Jerusalem, Israel, 30 Dec. 91-8 Jan. 92. Singapore : World Scientific, 1993.

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1942-, Fukuyama H., Maekawa S. 1946-, Malozemoff A. P, Nihon Ai Bī Emu Kabushiki Kaisha. et IBM Japan International Symposium on Strong Correlation and Superconductivity (1989 : Keidanren Guest House), dir. Strong correlation and superconductivity : Proceedings of the IBM Japan international symposium, Mt. Fuji, Japan, 21-25 May, 1989. Berlin : Springer-Verlag, 1989.

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Okiji, Ayao. Correlation Effects in Low-Dimensional Electron Systems : Proceedings of the 16th Taniguchi Symposium Kashikojima, Japan, October 25-29, 1993. Berlin, Heidelberg : Springer Berlin Heidelberg, 1994.

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Lee, Timothy J. Comparison of the quadratic configuration interaction and coupled cluster approaches to electron correlation including the effect of triple excitations. [Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1991.

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Lee, Timothy J. Comparison of the quadratic configuration interaction and coupled cluster approaches to electron correlation including the effect of triple excitations. [Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1991.

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Bertel, E., et A. Menzel. Nanostructured surfaces : Dimensionally constrained electrons and correlation. Sous la direction de A. V. Narlikar et Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.11.

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This article examines dimensionally constrained electrons and electronic correlation in nanostructured surfaces. Correlation effects play an important role in spatial confinement of electrons by nanostructures. The effect of correlation will become increasingly dominant as the dimensionality of the electron wavefunction is reduced. This article focuses on quasi-one-dimensional (quasi-1D) confinement, i.e. more or less strongly coupled one-dimensional nanostructures, with occasional reference to 2D and 0D systems. It first explains how correlated systems exhibit a variety of electronically driven phase transitions, and especially the phases occurring in the generic phase diagram of correlated materials. It then describes electron–electron and electron–phonon interactions in low-dimensional systems and the phase diagram of real quasi-1D systems. Two case studies are considered: metal chains on silicon surfaces and quasi-1D structures on metallic surfaces. The article shows that spontaneous symmetry breaking occurs for many quasi-1D systems on both semiconductor and metal surfaces at low temperature.
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Ellguth, Martin. A spin- and momentum-resolved photoemission study of strong electron correlation in Co/Cu. Logos Verlag Berlin, 2015.

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Segal, Jeffrey A. Ideology and Partisanship. Sous la direction de Lee Epstein et Stefanie A. Lindquist. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199579891.013.2.

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The question of whether partisan or ideological preferences influence judicial decision-making has been the subject of numerous studies. Due to the strong correlation between party and ideology, scholars have often chosen to examine the combined effects of party and ideology. Recently, however, and in spite of the fact that correlation between party and ideology is growing, scholars have begun to investigate the independent effects of party and ideology by studying a unique group of election law cases, where partisan and ideological considerations often conflict. There has also been an emerging interest in identifying the causes behind the increased polarization of the Court. The increased polarized of the Senate is one posited theory.
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Correlation effects in low-dimensional electron systems : Proceedings of the 16th Taniguchi symposium, Kashikojima, Japan, October 25-29, 1993. Berlin : Springer-Verlag, 1994.

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Fakuyama, H., et S. Maekawa. Strong Correlation and Superconductivity : Proceedings of the IBM Japan International Symposium, Mt. Fuji, Japan, 21-25 May, 1989 (Springer Series in Solid-State Sciences). Springer, 1989.

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Chapitres de livres sur le sujet "Strong Electron Correlation Effect"

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Plakida, Nikolai M. « Strong Electron Correlation Effects in Copper Oxides ». Dans Correlations, Coherence, and Order, 237–93. Boston, MA : Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4727-3_8.

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Fukuyama, H. « Strong Correlation and Strong Electron-Phonon Interaction — Peierls Transition with Mott Transition ». Dans Correlation Effects in Low-Dimensional Electron Systems, 128–32. Berlin, Heidelberg : Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85129-2_13.

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Hikami, S. « Matrix-Model Approach to Electron Correlations in a Strong Magnetic Field ». Dans Correlation Effects in Low-Dimensional Electron Systems, 154–60. Berlin, Heidelberg : Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85129-2_16.

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Kanazawa, I. « The Strong Electron Correlation Effect in Quasi-two dimensional organic superconductors ». Dans Advances in Superconductivity XII, 275–77. Tokyo : Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66877-0_79.

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Kohler, Markus C., Carsten Müller, Christian Buth, Alexander B. Voitkiv, Karen Z. Hatsagortsyan, Joachim Ullrich, Thomas Pfeifer et Christoph H. Keitel. « Electron Correlation and Interference Effects in Strong-Field Processes ». Dans Springer Proceedings in Physics, 209–17. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28948-4_35.

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Yosida, Kei. « Theory of Strong Electron Correlation ». Dans Theory of Magnetism, 181–99. Berlin, Heidelberg : Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03297-8_13.

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Fabrizio, Michele, Erio Tosatti, Massimo Capone et Claudio Castellani. « Enhancement of Superconductivity by Strong Correlations : A Model Study ». Dans Concepts in Electron Correlation, 95–113. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0213-4_10.

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Hlubina, R. « Josephson Effect In The Cuprates : Microscopic Implications ». Dans Concepts in Electron Correlation, 17–25. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0213-4_2.

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Lobos, A., et A. A. Aligia. « Projection of the Kondo Effect by Resonant Eigenstates Inside A Circular Quantum Corral ». Dans Concepts in Electron Correlation, 229–37. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0213-4_22.

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Sugai, S. « Raman Spectroscopy of Magnetic Compounds with Strong Electron-Correlation ». Dans Springer Series in Solid-State Sciences, 75–106. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04143-7_3.

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Actes de conférences sur le sujet "Strong Electron Correlation Effect"

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Torlina, L., M. Ivanov, Z. B. Walters et O. Smirnova. « Electron-ion correlation effects in strong field ionization ». Dans 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6801168.

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Grobe, R. « Theory of electron-electron-correlation effects in a 1-D two-electron system ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.thh.1.

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We present a two-electron quantum model for strong-field laser-atom studies. In this model all the essential interactions (electron-nucleus, electron-laser and especially electron-electron) are fully taken into account.
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Zhang, Jian, et P. Lambropoulos. « Nonperturbative time-dependent theory of two-electron atoms in strong fields ». Dans Applications of High Field and Short Wavelength Sources. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/hfsw.1997.fd1.

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We have developed an elaborate theoretical and computational approach for the study of strong field phenomena in two-electron atoms taking into account the electron-electron correlation in the dynamics of the process. The work grew in three stages. In the first stage, we developed the essentials of the approach which consists of a discretized L2-basis of atomic states constructed in terms of B-splines. These are completely correlated two-electron states in terms of which we expand the time-dependent wavefunction satisfying the Schrödinger equation which includes the interaction with the time-dependent laser field represented by a realistic pulse shape. Recently published results[1, 2] include ATI and photoelectron angular distributions in He which showed very small correlation effects as evaluated through a comparison with frozen core or single-active-electron calculations which are conveniently performed using the same technique.
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Liu, Duncan T. H., Li-Jen Cheng et Jae-Hoon Kim. « Applied Electric Field Effect on Photorefractive GaAs ». Dans Photorefractive Materials, Effects, and Devices II. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pmed.1991.tua5.

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Compound semiconductors such as GaAs are known to be very fast photorefractive materials. However, due to their relatively small electro-optic coefficient, their diffraction efficiency is much smaller than that of most oxide materials such as BaTiO3. Even so, easily detectable signal with fairly good signal to noise ratio can be usually achieved in a GaAs based application without the aid of an external electric field due to the cross-polarization coupling1 capability of GaAs and the high sensitivity of modern video cameras. For example, in a recently demonstrated real-time optical image correlator2, the correlation output was normally strong enough to saturate the vidicon camera used. On the other hand, in some applications such as the ring oscillator, the double phase conjugate mirror, and the self-pumped phase conjugator, a sufficiently large net two-beam coupling gain is needed. In compound semiconductors, net gain had been achieved by applied electric field techniques. However, in general, these techniques have two side effects, namely the Schottky-barrier effect3 and the low-frequency current oscillation effect4. Depending on the particular requirement of an application, these effects may or may not be a problem. But, they are not desired in general. In this paper, we report the results of a study on the electrode material dependence of the Schottky-barrier effect in the undoped GaAs crystal. In particular, the widely-used silver-paste electrodes are compared with thermally-evaporated alloy electrodes.
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Ludwiczak, Katarzyna, Johannes Binder, Aleksandra Krystyna Dąbrowska, Joanna Sitnicka, Jacek Jasiński, Roman Stępniewski et Andrzej Wysmołek. « Probing the emission from hexagonal boron nitride with 2D magnets ». Dans Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.cmp14a_02.

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We explore the proximity effect between hexagonal boron nitride and two-dimensional magnets. A strong correlation between the optical emission from hBN and a magnetic phase transition in CrBr3 is found. Our approach demonstrates a novel method to locally apply magnetic fields and address selected defects.
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Meschter, Stephan, et Stephen McKeown. « Effect of Hot Solder Dipping on Part Stresses ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66322.

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Hot solder dipping is an accepted method to mitigate whisker growth on electronic components plated with pure tin. To provide the best protection from tin whiskers, the solder coating needs to be up to the package body. The conventional wisdom for solder dipping maintains that dipping up to the package body can cause component damage. If the specific construction differences of ceramic and plastic-encapsulated parts are considered, it appears that while temperature gradients are important for ceramic parts, temperature is the major factor in failure of plastic parts. Finite-element analysis (FEA) is used to determine internal stresses resulting from solder dipping. Transient thermal FEA analysis is used to determine the temperature distribution inside the part and a static structural FEA is used to calculate internal stresses. For a 128-lead plastic part, maximum stresses from dipping the side of the package are 35% of those expected in reflow and 37% higher than that expected if only the lead tip is dipped. For a 184-lead ceramic part, dipping until the package side touches the solder increases stresses by a factor of more than three over dipping the lead to within 10-mils (0.25 mm) from the package body. Plotting the maximum relative stress as a function of maximum semiconductor die temperature shows a strong linear correlation between maximum temperature and stress for plastic — a correlation not observed for a ceramic part.
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Kimble, H. J., et R. J. Cook. « Monitoring quantum transitions in a three-level atom ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.fn1.

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In a recent publication1 the question of the possibility of observing directly the quantum jumps associated with the excitation and deexcitation of an atomic electron in a three-level transition was considered. While the analysis of Ref. 1 reveals the manner in which the fluorescence from a strong transition of a lifetime T1 is modulated by the absorption and emission processes of a weak transition of lifetime T2 (T1 ≪ T2), it was restricted to the case of incoherent excitation of the two transitions. The purpose of the present work is to reconsider this problem for monochromatic excitation in which a variety of coherent effects come into play. The analysis proceeds in a straightforward fashion in the Heisenberg representation to yield expressions for field and atomic correlation functions representing probabilities for the detection of successive photons from the same transition as well as for cross correlations of emission probabilities. In the limit of T1 ≪ T2, a coarse graining of time with respect to the strong transition produces expressions analogous to those presented in Ref. 1. The roles of Autler-Townes splitting, frequency detuning, and saturation of the weak transition are discussed.
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Lacoste, D. A., J. P. Moeck, D. Durox, C. O. Laux et T. Schuller. « Effect of Nanosecond Repetitively Pulsed Discharges on the Dynamics of a Swirl-Stabilized Lean Premixed Flame ». Dans ASME Turbo Expo 2013 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94769.

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The effects of Nanosecond Repetitively Pulsed (NRP) plasma discharges on the dynamics of a swirl-stabilized lean premixed flame are investigated experimentally. Voltage pulses of 8-kV amplitude and 10-ns duration are applied at a repetition rate of 30 kHz. The average electric power deposited by the plasma is limited to 40 W, corresponding to less than 1 % of the thermal power of 4 kW released by the flame. The investigation is carried out with a dedicated experimental setup that allows for studies of the flame dynamics with applied plasma discharges. A loudspeaker is used to perturb the flame acoustically, and the discharges are generated between a central pin electrode and the rim of the injection tube. Velocity and CH* chemiluminescence signals are used to determine the flame transfer function assuming that plasma discharges do not affect the correlation between CH* emission and heat release rate fluctuations. Phase-locked images of the CH* emission were recorded to assess the effect of the plasma on the oscillation of the flame. The results show a strong influence of the NRP discharges on the flame response to acoustic perturbations, thus opening interesting perspectives for combustion control. An interpretation of the modifications observed in the transfer function of the flame is proposed by taking into account the thermal and chemical effects of the discharges. It is then demonstrated that by applying NRP discharges at unstable conditions, the oscillation amplitudes can be reduced by an order of magnitude, thus effectively stabilizing the system.
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Ghosh, Haranath. « Strong electron correlation and nonlinear optics ». Dans FUNCTIONAL MATERIALS : Proceedings of the International Workshop on Functional Materials (IWFM-2011). AIP, 2012. http://dx.doi.org/10.1063/1.4736884.

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Wu, Shuyu, Jie Zhang, Yuchao Cai et Gang Liu. « Design and research of household small electric drill based on users' perceptual needs ». Dans 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001805.

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Objective: in order to solve the problem that the existing electric drill does not consider the perceptual needs of users, optimize the existing household electric drill, Bring better "double experience" to users (emotional experience and use experience) and improve the visual presentation effect of the electric drill. Methods:1, collect the samples of the existing electric drill through network collection and field investigation, and analyze the modeling characteristics, color and material of the electric drill in the market, as well as the volume and operability of the electric drill through the collected pictures of the electric drill. Classify and summarize the pictures, screen them by experts, and eliminate them after they are similar to the samples, Eight relevant samples were obtained; 2： Through investigation, it is found that the appearance and shape of the existing household electric drill are lack of aesthetics, the volume is large, it is difficult to master, and dust will be scattered in use, which is lack of environmental protection and safety. Therefore, this paper positions the design of household electric drill products as beautiful, small, easy to operate, environmental protection and safety. 3： Through user research and brainstorming, the vocabulary that is not of great significance to the design of household electric drill products is deleted, and 6 pairs of perceptual image words are selected; 4： Starting from users' perceptual needs, understand users' emotional needs, use the semantic difference method in perceptual engineering, and make a seven level test scale according to the eight samples and six pairs of perceptual words. Collect users' emotional demands for household electric drill through the seven level scale questionnaire, and according to the results of the survey questionnaire, The entropy weight method is used to analyze the questionnaire data and the correlation between the data. Results: 1: the reliability of the data was evaluated, and the results showed that the questionnaire results had good reliability, 2： After standardizing the survey data by entropy weight method and relevant calculation, the importance ranking of six pairs of perceptual words and the data indicators between each sample are obtained. The correlation, strong correlation and strong correlation between words are calculated by Pearson correlation; 3： According to the above data processing results, it is found that the most important thing of household electric drill is environmental protection, which means that the electric drill will not produce a large amount of debris to pollute the surrounding environment and human health during use; Labor saving and light means that the overall volume of the electric drill should be light and easy to master, so as not to make the hole deviate; Simplicity is to minimize the complex design of product modeling design, and it is found that there is a strong correlation between labor-saving, lightness and simplicity. Therefore, the above perceptual words correspond to the design elements of household electric drill respectively, and a household small electric drill is designed according to the samples with high scores. Conclusion: under the guidance of semantic difference method and entropy weight method in perceptual engineering, the users' perceptual emotional needs are rationalized and digitized, the subjective components of designers in designing products are reduced, and a certain direction is provided for the design of household electric drill, so as to design a household electric drill more in line with the users' perceptual needs.
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Rapports d'organisations sur le sujet "Strong Electron Correlation Effect"

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Mazziotti, David A. Parallel Large-scale Semidefinite Programming for Strong Electron Correlation : Using Correlation and Entanglement in the Design of Efficient Energy-Transfer Mechanisms. Fort Belvoir, VA : Defense Technical Information Center, septembre 2014. http://dx.doi.org/10.21236/ada617270.

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Yao, Yongxin. Thermodynamic prediction of glass formation tendency, cluster-in-jellium model for metallic glasses, ab initio tight-binding calculations, and new density functional theory development for systems with strong electron correlation. Office of Scientific and Technical Information (OSTI), janvier 2009. http://dx.doi.org/10.2172/972073.

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Fieldsend, Astrid. Evidence and Lessons Learned Regarding the Effect of Equitable Quality Education on ‘Open Society’. Institute of Development Studies (IDS), mai 2021. http://dx.doi.org/10.19088/k4d.2021.094.

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The purpose of this review is to assist FCDO in understanding the evidence of impact and any valuable lessons regarding the effect equitable quality education can have on ‘open society’. The search revealed that there is a considerable volume of evidence which focuses on education’s ability to reduce poverty, increase economic growth, boost employability and achieve better health outcomes. There is less which focuses on the aspects of ‘open society’ as defined in this paper. The scope of this review was narrowed to focus upon areas of the ‘open society’ definition where the most evidence does exist, given the timeframe for the review. The scope was narrowed to focus on: democracy, civic engagement, and social cohesion. The review of the literature found strong evidence that equitable quality education can have a range of positive impacts on democracy (specifically, its institutions and processes), civic engagement and social cohesion. There is a considerable body of evidence which indicates that there is a correlation between equitable quality education and benefits to societies (more peaceful, higher levels of trust, greater participation in politics, etc). However, there was no clear evidence that investment in equitable quality education directly leads to positive societal outcomes. This is because there are so many other factors to account for in attempting to prove causation. The lack of rigorous studies which attempt to attribute causation demonstrates a clear evidence gap. It is important to note that education systems themselves are politicised and cannot be divorced from the political process. The extent to which education can impact positively on open society depends a great deal on the value education has within the political system in which it is operating.
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Benn, D., R. Linnen et T. Martins. Evaluating white mica as an indicator mineral for lithium bearing pegmatites, Wekusko Lake pegmatite field, Manitoba, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328982.

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This project investigates the potential use of white micas as an indicator mineral within Li-bearing pegmatites and the potential of field portable techniques, such as Raman spectroscopy and Laser Induced Breakdown Spectroscopy (LIBS) as real-time techniques in exploration. The pegmatites in the Wekusko Lake field, Manitoba, Canada, display five zones of varying mineralization. White micas display two textures in the field (primary igneous and secondary) and four textures were identified by backscattered electron imaging (poor zonation, rimmed, patchy and exsolution). The white micas were analysed by Electron Probe Micro-Analysis (EPMA) and Laser Ablation Induction-Coupled Plasma Mass Spectroscopy (LA-ICP-MS) and the results show a strong correlation in the Li content of the white mica and the whole rock Li2O obtained from the assays of drill core. The K/Rb vs. Cs contents of the white mica indicate that the most prospective dikes contain moderate to highly evolved grains. The use of portable Raman Spectrometer, while useful for mineral identification, was not able to detect a significant Li signature at the concentrations tested (1500-6000 ppm).
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Manninen, Terhikki, et Pauline Stenberg. Influence of forest floor vegetation on the total forest reflectance and its implications for LAI estimation using vegetation indices. Finnish Meteorological Institute, 2021. http://dx.doi.org/10.35614/isbn.9789523361379.

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Recently a simple analytic canopy bidirectional reflectance factor (BRF) model based on the spectral invariants theory was presented. The model takes into account that the recollision probability in the forest canopy is different for the first scattering than the later ones. Here this model is extended to include the forest floor contribution to the total forest BRF. The effect of the understory vegetation on the total forest BRF as well as on the simple ratio (SR) and the normalized difference (NDVI) vegetation indices is demonstrated for typical cases of boreal forest. The relative contribution of the forest floor to the total BRF was up to 69 % in the red wavelength range and up to 54 % in the NIR wavelength range. Values of SR and NDVI for the forest and the canopy differed within 10 % and 30 % in red and within 1 % and 10 % in the NIR wavelength range. The relative variation of the BRF with the azimuth and view zenith angles was not very sensitive to the forest floor vegetation. Hence, linear correlation of the modelled total BRF and the Ross-thick kernel was strong for dense forests (R2 > 0.9). The agreement between modelled BRF and satellite-based reflectance values was good when measured LAI, clumping index and leaf single scattering albedo values for a boreal forest were used as input to the model.
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Amirav, Aviv, et Steven Lehotay. Fast Analysis of Pesticide Residues in Agricultural Products. United States Department of Agriculture, novembre 2002. http://dx.doi.org/10.32747/2002.7695851.bard.

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The overall theme of this project was to increase the speed of analysis for monitoring pesticide residues in food. Traditionally, analytical methods for multiple pesticides are time-consuming, expensive, laborious, wasteful, and ineffective to meet critical needs related to food safety. Faster and better methods were needed to provide more cost-effective detection of chemical contaminants, and thus provide a variety of benefits to agriculture. This overarching goal to speed and improve pesticide analysis was successfully accomplished even beyond what was originally proposed by the investigators in 1998. At that time, the main objectives of this project were: 1) to further develop a direct sample introduction (DSI) device that enables fast sampling and introduction of blended-only agricultural products for analysis by gas chromatography (GC); 2) to evaluate, establish, and further develop the method of simultaneous pulsed flame photometric detector (PFPD) and mass spectrometry (MS) detection for enhanced pesticide identification capabilities; and 3) to develop a new and novel MS pesticide analysis method, based on the use of supersonic molecular beams (SMB) for sampling and ionization. The first and third objectives were successfully accomplished as proposed, and the feasibility of the second objective was already demonstrated. The capabilities of the GC/SMB-MS approach alone were so useful for pesticide analysis that the simultaneous use of a PFPD was considered superfluous. Instead, the PFPD was investigated in combination with an electron-capture detector for low-cost, simultaneous analysis of organophosphorus and organochlorine pesticides in fatty foods. Three important, novel research projects not originally described in the proposal were also accomplished: 1) development of the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for pesticides in foods; 2) development and optimization of a method using low-pressure (LP) GC/MS to speed pesticide residue analysis; and 3) innovative application of analyte protectants to improve the GC analysis of important problematic pesticides. All of the accomplishments from this project are expected to have strong impact to the analytical community and implications to agriculture and food safety. For one, an automated DSI approach has become commercially available in combination with GC/MS for the analysis of pesticide residues. Meanwhile, the PFPD has become the selective detector of choice for the analysis of organophosphorus pesticides. Great strides were made in SMB-MS through the manufacture of a prototype "Supersonic GC/MS" instrument, which displayed many advantages over commercial GC/MS instruments. Most notably, the QuEChERS method is already being disseminated to routine monitoring labs and has shown great promise to improve pesticide analytical capabilities and increase lab productivity. The implications of these developments to agriculture will be to increase the percentage of food monitored and the scope of residues detected in the food, which will serve to improve food safety. Developed and developing countries alike will be able to use these methods to lower costs and improve results, thus imported/exported food products will have better quality without affecting price or availability. This will help increase trade between nations and mitigate certain disputes over residue levels in imported foods. The improved enforcement of permissible residue levels provided by these methods will have the effect to promote good agricultural practices among previously obstinate farmers who felt no repercussions from illegal or harmful practices. Furthermore, the methods developed can be used in the field to analyze samples quickly and effectively, or to screen for high levels of dangerous chemicals that may intentionally or accidentally appear in the food supply.
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