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Artykuły w czasopismach na temat „Strong Electron Correlation Effect”

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Data publikacji: 7 września 2023

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1

BOERI, LILIA, EMMANUELE CAPPELLUTI, CLAUDIO GRIMALDI i LUCIANO PIETRONERO. "EFFECT OF STRONG CORRELATION ON THE ELECTRON-PHONON INTERACTION". International Journal of Modern Physics B 14, nr 25n27 (30.10.2000): 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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2

Song, Weiyu, Jing Wang, Jian Meng i Zhijian Wu. "Strong electron correlation effect of Ru 4d electrons in La2NiRuO6 and La2ZnRuO6". Chemical Physics Letters 486, nr 1-3 (luty 2010): 27–31. http://dx.doi.org/10.1016/j.cplett.2009.12.070.

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3

Nagaoka, Yosuke. "The Kondo Effect: from Resistance Minimum to Strong Electron Correlation". JPSJ News and Comments 2 (14.01.2005): 01. http://dx.doi.org/10.7566/jpsjnc.2.01.

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4

Egami, T., S. Ishihara i M. Tachiki. "Lattice Effect of Strong Electron Correlation: Implication for Ferroelectricity and Superconductivity". Science 261, nr 5126 (3.09.1993): 1307–10. http://dx.doi.org/10.1126/science.261.5126.1307.

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5

ZHANG, JIAN, i P. LAMBROPOULOS. "NONPERTURBATIVE TIME-DEPENDENT THEORY OF TWO-ELECTRON ATOMS IN STRONG LASER FIELDS". Journal of Nonlinear Optical Physics & Materials 04, nr 03 (lipiec 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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6

CAPONE, M. "INTERPLAY OF STRONG CORRELATION AND JAHN-TELLER EFFECT IN ORBITALLY DEGENERATE SYSTEMS". International Journal of Modern Physics B 14, nr 29n31 (20.12.2000): 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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7

Mazziotti, David A. "Effect of strong electron correlation on the efficiency of photosynthetic light harvesting". Journal of Chemical Physics 137, nr 7 (21.08.2012): 074117. http://dx.doi.org/10.1063/1.4746244.

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8

Rozenberg, M. J., I. H. Inoue i M. J. Sánchez. "Strong electron correlation effects in nonvolatile electronic memory devices". Applied Physics Letters 88, nr 3 (16.01.2006): 033510. http://dx.doi.org/10.1063/1.2164917.

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9

Das, Tanmoy, R. S. Markiewicz i A. Bansil. "Strong correlation effects and optical conductivity in electron-doped cuprates". EPL (Europhysics Letters) 96, nr 2 (1.10.2011): 27004. http://dx.doi.org/10.1209/0295-5075/96/27004.

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10

Zakrzewski, Viatcheslav G., Olga Dolgounitcheva i J. V. Ortiz. "Strong correlation effects in the electron binding energies of phthalocyanine". International Journal of Quantum Chemistry 109, nr 15 (30.07.2009): 3619–25. http://dx.doi.org/10.1002/qua.22360.

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11

Kashirina, N. I. "Investigation of electron correlation effect on energy spectrum of two-electron systems in crystals with strong electron-phonon coupling". Semiconductor Physics, Quantum Electronics and Optoelectronics 5, nr 3 (10.12.2002): 235–42. http://dx.doi.org/10.15407/spqeo5.03.235.

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12

Krive, I. V., R. I. Shekhter, S. M. Girvin i M. Jonson. "Aharonov-Bohm effect in a quantum ring with strong electron-electron correlations". Physica Scripta T54 (1.01.1994): 123–27. http://dx.doi.org/10.1088/0031-8949/1994/t54/029.

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13

PANG, XIAO-FENG. "THE PROPERTIES OF NONADIABATIC FLUCTUATIONS IN STRONGLY COUPLED ELECTRON–PHONON SYSTEMS WITH CORRELATED DISPLACEMENT AND SQUEEZING". International Journal of Modern Physics B 16, nr 31 (10.12.2002): 4783–808. http://dx.doi.org/10.1142/s0217979202014632.

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A new variational ansatz for the coherent phonons with correlated displacement and squeezing, including interaction with electrons are used to study the properties of (i) the nonadiabatic phonon fluctuation on the ground state, (ii) the uncertainty principle, (iii) the phonon-staggered ordering, and (iiv) the charge-density wave order, of the systems due to fluctuations of the electron density in a coupled electron–phonon systems. The results obtained show that the correlation effect can lower the energy of the ground state of the systems, enhance the stabilization of the polaron and suppress the quantum increase of the classical polaron narrowing of electron band. Moreover, it add to the effects of nonadiabaticity on the minimum quantum uncertainty for the phonon coordinate by a strong coupling with the electron density for a large squeezing as compared with the adiabatic case and the uncorrelated case. Therefore, the new ansatz which can represent the correlation effects of displacement and squeezing is especially relevant for system with sufficiently large squeezing and strong coupling.

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14

YU, ZHI-MING, QING-WEI WANG i YU-LIANG LIU. "THE ELECTRONIC CORRELATION EFFECT FROM WEAK TO STRONG IN THE THREE DIMENSIONAL ELECTRON GAS". International Journal of Modern Physics B 26, nr 11 (30.04.2012): 1250065. http://dx.doi.org/10.1142/s0217979212500658.

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Based on the success of the eigenfunctional theory ( EFT) in the one-dimensional model,16,24,51 we apply it to the three-dimensional homogeneous electron gas. By EFT, we first present a rigorous expression of the pair distribution function g(r) of the electron gas. This expression effectively solves the negative problem of g(r) that when electronic correlation effect is strong, the previous theories give a negative g(r),9 while g(r) is strictly a positive function. From this reasonable g(r), we estimate and establish a newly effective fitting expression of the ground state energy of electron gas. The new fitting expression presents a similar result with present theories when rs is small, since only in the limit of rs is small, present theories estimate a exact ground state energy. When rs increases, the difference between EFT and other theories becomes more and more remarkable. The difference is expected as EFT estimates a reasonable g(r) and would effectively amend the overestimate of previous theories in the ground state energy. In addition, by the ground state energy, we estimate the phase transition derived by the strong correlation effect. When the density decreases, the electronic correlation effect changes from weak to strong and we observe a sudden phase transition from paramagnetic to full spin polarization occurring at rs = 31 ± 4.

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15

Zeng, Jiaolong, Chen Ye, Pengfei Liu, Cheng Gao, Yongjun Li i Jianmin Yuan. "The Strong Enhancement of Electron-Impact Ionization Processes in Dense Plasma by Transient Spatial Localization". International Journal of Molecular Sciences 23, nr 11 (27.05.2022): 6033. http://dx.doi.org/10.3390/ijms23116033.

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Recent experiments have observed much higher electron–ion collisional ionization cross sections and rates in dense plasmas than predicted by the current standard atomic collision theory, including the plasma screening effect. We suggest that the use of (distorted) plane waves for incident and scattered electrons is not adequate to describe the dissipation that occurs during the ionization event. Random collisions with free electrons and ions in plasma cause electron matter waves to lose their phase, which results in the partial decoherence of incident and scattered electrons. Such a plasma-induced transient spatial localization of the continuum electron states significantly modifies the wave functions of continuum electrons, resulting in a strong enhancement of the electron–ion collisional ionization of ions in plasma compared to isolated ions. Here, we develop a theoretical formulation to calculate the differential and integral cross sections by incorporating the effects of plasma screening and transient spatial localization. The approach is then used to investigate the electron-impact ionization of ions in solid-density magnesium plasma, yielding results that are consistent with experiments. In dense plasma, the correlation of continuum electron energies is modified, and the integral cross sections and rates increase considerably. For the ionization of Mg9+e+1s22s2S→1s21S+2e, the ionization cross sections increase several-fold, and the rates increase by one order of magnitude. Our findings provide new insight into collisional ionization and three-body recombination and may aid investigations of the transport properties and nonequilibrium evolution of dense plasma.

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16

DAHLEN, NILS ERIK. "EFFECT OF ELECTRON CORRELATION ON THE TWO-PARTICLE DYNAMICS OF A HELIUM ATOM IN A STRONG LASER PULSE". International Journal of Modern Physics B 16, nr 03 (30.01.2002): 415–52. http://dx.doi.org/10.1142/s0217979202007987.

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This review discusses the complicated two-electron dynamics of a helium atom in an intense, short laser pulse. A helium gas in femtosecond laser pulses at long wave lengths (λ~700 nm) and high intensities (I~1015 W /cm2) produces surprisingly high numbers of He2+ ions. These laser fields cause large and fast electron oscillations, which makes a solution of the time-dependent Schrödinger equation numerically demanding. The system can be studied using a one-dimensional model atom, which has many of the same properties as the He atom. Using the one-dimensional model, the importance of including electron correlation in a simplified description of the two-electron dynamics is demonstrated. It is shown that electron correlation becomes much less important if the laser field has a short wave length, in which case the electron oscillations are smaller and slower. The problem of including electron correlation in the calculations is discussed in terms of approaches such as time-dependent Hartree–Fock, time-dependent density functional theory and time-dependent extended Hartree–Fock. Some of the commonly used semi-classical models for describing the double-ionization process are presented.

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17

Yu, Zhi-Ming, Qian Guo i Yu-Liang Liu. "New Method to Deal with Three-Dimensional Electron Gas with a Strong Correlation Effect". Chinese Physics Letters 29, nr 12 (grudzień 2012): 127101. http://dx.doi.org/10.1088/0256-307x/29/12/127101.

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18

Mozyrsky, D., i I. Martin. "Effects of Strong Correlations in Single Electron Traps in Field-Effect Transistors". IEEE Transactions On Nanotechnology 4, nr 1 (styczeń 2005): 90–95. http://dx.doi.org/10.1109/tnano.2004.840162.

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19

YARTSEV, V. M., M. R. SINGH i J. DESFORGES. "EFFECT OF HOPPING AND ELECTRONIC CORRELATION ON ELECTRON–HOLE COUPLING IN DISORDERED SEMICONDUCTOR DOUBLE LAYER". International Journal of Modern Physics B 17, nr 30 (10.12.2003): 5773–80. http://dx.doi.org/10.1142/s0217979203023239.

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The effect of the hopping term in the formation of excitons is studied in semiconductor nanostructures where electrons and holes are spatially separated by a potential barrier. We use the lattice gas model where electron–hole system is divided into unit cells with the effective lattice constant being of the order of the exciton size. The exciton density is calculated as a function of the disorder for several fixed values of the hopping integral. It is found that as the value of the hopping integral increases the exciton density decreases rapidly both for weak and strong disorder. Electronic correlation is treated explicitly by introducing repulsion between equally charged carriers and attraction between an electron and a hole from neighboring cells.

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20

Aplesnin, S. S., i A. I. Moskvin. "Effect of strong electron correlations and electron-lattice interaction on the ordering of electron orbitals". JETP Letters 92, nr 4 (sierpień 2010): 226–31. http://dx.doi.org/10.1134/s0021364010160071.

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21

Avramov, P. V., i S. G. Ovchinnikov. "The Strong Electron Correlation Effects in XAFS Spectra of HTSC Cuprates". Le Journal de Physique IV 7, nr C2 (kwiecień 1997): C2–183—C2–185. http://dx.doi.org/10.1051/jp4/1997158.

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22

Bansil, A., R. S. Markiewicz, C. Kusko, M. Lindroos i S. Sahrakorpi. "Matrix element and strong electron correlation effects in ARPES from cuprates". Journal of Physics and Chemistry of Solids 65, nr 8-9 (sierpień 2004): 1417–21. http://dx.doi.org/10.1016/j.jpcs.2003.12.010.

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23

Fraiman, G. M., V. A. Mironov i A. A. Balakin. "Correlation effects in electron-ion collisions in a strong laser field". Journal of Experimental and Theoretical Physics 88, nr 2 (luty 1999): 254–62. http://dx.doi.org/10.1134/1.558792.

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24

Dürr, H. A., G. van der Laan, D. Spanke, F. U. Hillebrecht i N. B. Brookes. "Strong spin-dependent electron correlation effects in photoemission from itinerant magnets". Europhysics Letters (EPL) 40, nr 2 (15.10.1997): 171–76. http://dx.doi.org/10.1209/epl/i1997-00441-9.

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25

Gericke, D. O., S. Kosse, M. Schlanges i M. Bonitz. "Strong Correlation (T-Matrix) Effects in Electron-Hole Plasmas in Semiconductors". physica status solidi (b) 206, nr 1 (marzec 1998): 257–63. http://dx.doi.org/10.1002/(sici)1521-3951(199803)206:1<257::aid-pssb257>3.0.co;2-l.

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26

Swain, Rashmirekha, Sivabrata Sahu i G. C. Rout. "Model Study of the Role of Impurity on the Ferromagnetic Order in Graphene-on-Substrate". Advanced Science Letters 24, nr 8 (1.08.2018): 5960–63. http://dx.doi.org/10.1166/asl.2018.12227.

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We report here a tight-binding calculation to investigate the effect of doping on the ferromagnetism in graphene supported by different substrates. The Hamiltonian consists of electron hoppings in the graphene upto third-nearest-neighbors. The substrate introduces in-equivalence in the two sub-lattices of carbon in the honey-comb lattice. The strong Coulomb correlation between electrons at the sub-lattices produces ferromagnetic order in the system. The doping introduces further in-equivalence in the sub-lattices and is expected to stabilize the ferromagnetic order. The Green’s functions are calculated by using Zubarev’s Green’s function technique. Finally the ferromagnetic magnetizations and hence the ferromagnetic gap are calculated from the electron correlations obtained from the corresponding electron Green’s functions. The ferromagnetic gap equation is computed numerically and self-consistently by using 100 × 100 grid points of the electron momentum. The effect of doping on the temperature dependent ferromagnetic gap is investigated by varying different doping concentrations, impurity potential and Coulomb energy.

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27

Barišić, S., i E. Tutiš. "Effect of strong electron correlations on the electron-phonon coupling in high Tc superconductors". Solid State Communications 87, nr 6 (sierpień 1993): 557–61. http://dx.doi.org/10.1016/0038-1098(93)90596-f.

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28

PANFILOV, A. S., i I. V. SVECHKAREV. "THE MAGNETOVOLUME EFFECT IN STRONG ITINERANT PARAMAGNETS". International Journal of Modern Physics B 07, nr 01n03 (styczeń 1993): 699–702. http://dx.doi.org/10.1142/s0217979293001475.

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The results of investigations of the enhanced spin susceptibility of some transition metals and alloys under pressure are reviewed and discussed. The evaluated values of the volume derivative of the interaction parameter d In J/d In V unambiguously confirm the predominant role of the short-range electron correlations in these systems.

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29

SALKOLA, MARKKU I., SUDIP CHAKRAVARTY i STEVEN A. KIVELSON. "ELECTRONIC CORRELATIONS AND ELECTRON-PHONON COUPLING IN C60". International Journal of Modern Physics B 07, nr 15 (10.07.1993): 2859–84. http://dx.doi.org/10.1142/s0217979293003073.

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We study a model of a single molecule of C 60 to obtain an understanding of the interplay between the electron-electron and electron-phonon interactions in these molecules. In particular, we calculate the intramolecular phonon spectrum, infrared intensities, and the Raman intensities. We also find that when correlation effects are sufficiently strong, the Jahn-Teller distortion of the doubly charged molecule is suppressed. Thus, if the correlation effects are strong, the superconductivity in doped C 60 cannot be mediated by intra-molecular Jahn-Teller phonons.

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30

Kakehashi, Y., i J. H. Samson. "Evidence of strong electron correlation effects on thermal expansion in transition metals". Physical Review B 34, nr 3 (1.08.1986): 1734–37. http://dx.doi.org/10.1103/physrevb.34.1734.

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31

Iwazaki, Aiichi. "Josephson Effects in Double-Layer Quantum Hall States". Modern Physics Letters B 12, nr 09 (20.04.1998): 327–33. http://dx.doi.org/10.1142/s021798499800041x.

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Under quite plausible assumptions on double-layer quantum Hall states with strong interlayer correlation, we show in general framework that coherent tunneling of a single electron between two layers is possible. It yields Josephson effects with unit charge tunneling. The origin is that Halperin states in the quantum Hall states are highly degenerate in electron number difference between two layers in the absence of electrons tunneling.

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32

Anokhin, A. O., V. Yu Irkhin i M. I. Katsnelson. "On the effect of strong electron correlations on various superconductivity mechanisms". Physica C: Superconductivity 179, nr 1-3 (sierpień 1991): 167–75. http://dx.doi.org/10.1016/0921-4534(91)90025-t.

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33

PETROFF, Y., P. THIRY, G. ROSSI, A. REVCOLEVSCHI i J. JEGOUDEZ. "OBSERVATION OF STRONG ELECTRON CORRELATIONS IN YBa2Cu3O7−δ BY hν DEPENDENT PHOTOELECTRON SPECTROSCOPY". International Journal of Modern Physics B 01, nr 03n04 (sierpień 1987): 831–45. http://dx.doi.org/10.1142/s0217979287001195.

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After a review of the understanding of resonant photoemission phenomena we present photoemission spectra from single phase YBa2Cu3O7−δ which have been measured in the photon energy range 17–130 eV, at T=80 K, T=300 K and intermediate temperatures using synchrotron radiation. Intense satellites associated with the Cu 3d and O 2p bands are observed to undergo resonances at the Cu 3p and O 2s core level excitation thresholds respectively indicating the presence of holes in the Cu and O hybrid bands on both Cu and O sites. The strong correlation effects for the valence electrons suggest that one electron calculations may not be appropriate for a detailed description of the electronic properties of this material.

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NEILSON, D., i J. S. THAKUR. "EFFECTS OF CORRELATIONS AND DISORDER IN QUANTUM WIRES". International Journal of Modern Physics B 13, nr 05n06 (10.03.1999): 489–95. http://dx.doi.org/10.1142/s0217979299000382.

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We calculate electron-electron correlation effects in a one-dimensional electron liquid at low densities using the self-consistent scheme of Singwi, Tosi, Land and Sjölander (STLS). We determine the static structure factor S(q) and plasmon dispersion ω pl (q) for different electron densities. We also include the effects of disorder and calculate the dependence of correlation effects on the electron scattering rate off disorder. Using the scattering rate γ we determine transport properties like the mean-free path, the peak mobility and the boundary between weak and strong localisation phases. We note a relation between the peak mobility and this boundary.

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35

Shustin M.S. i Aksenov S.V. "Effect of strong intersite Coulomb interaction on the topological properties of a superconducting nanowire". Physics of the Solid State 63, nr 13 (2022): 1625. http://dx.doi.org/10.21883/pss.2022.13.52301.23s.

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For superconducting nanowire with the pairing of extended s-type symmetry, Rashba spin-orbit interaction in a magnetic field, the influence of strong intersite charge correlations on single-particle Majorana excitations is analyzed. This problem is investigated on the basis of the density matrix renormalization group numerical method. It is shown that with an increase in the repulsion intensity of electrons located at the neighboring sites, two subbands emerge in the lower Hubbard band of the open system. Based on calculations of the Majorana polarization and degeneracy of the entanglement spectrum, it was found that a topologically nontrivial phase with one edge state survives at the edge of each of the subbands where the concentration of electrons or holes is minimal. Keywords: superconducting nanowires, Majorana zero modes, strong electron correlations.

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Shustin M.S. i Aksenov S.V. "Effect of strong intersite Coulomb interaction on the topological properties of a superconducting nanowire". Physics of the Solid State 63, nr 13 (2022): 2089. http://dx.doi.org/10.21883/pss.2022.13.53972.23s.

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For superconducting nanowire with the pairing of extended s-type symmetry, Rashba spin-orbit interaction in a magnetic field, the influence of strong intersite charge correlations on single-particle Majorana excitations is analyzed. This problem is investigated on the basis of the density matrix renormalization group numerical method. It is shown that with an increase in the repulsion intensity of electrons located at the neighboring sites, two subbands emerge in the lower Hubbard band of the open system. Based on calculations of the Majorana polarization and degeneracy of the entanglement spectrum, it was found that a topologically nontrivial phase with one edge state survives at the edge of each of the subbands where the concentration of electrons or holes is minimal. Keywords: superconducting nanowires, Majorana zero modes, strong electron correlations.

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37

Magazzeni, Christopher M., Hazel M. Gardner, Inigo Howe, Phillip Gopon, John C. Waite, David Rugg, David E. J. Armstrong i Angus J. Wilkinson. "Nanoindentation in multi-modal map combinations: a correlative approach to local mechanical property assessment". Journal of Materials Research 36, nr 11 (4.01.2021): 2235–50. http://dx.doi.org/10.1557/s43578-020-00035-y.

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Abstract A method is presented for the registration and correlation of property maps of materials, including data from nanoindentation hardness, Electron Back-Scattered Diffraction (EBSD), and Electron Micro-Probe Analysis (EPMA). This highly spatially resolved method allows for the study of micron-scale microstructural features, and has the capability to rapidly extract correlations between multiple features of interest from datasets containing thousands of data points. Two case studies are presented in commercially pure (CP) titanium: in the first instance, the effect of crystal anisotropy on measured hardness and, in the second instance, the effect of an oxygen diffusion layer on hardness. The independently collected property maps are registered using affine geometric transformations and are interpolated to allow for direct correlation. The results show strong agreement with trends observed in the literature, as well as providing a large dataset to facilitate future statistical analysis of microstructure-dependent mechanisms. Graphical abstract

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38

Mahmood, Raghad Imad. "Charge density distributions and electron scattering form factors of 19F, 27Al and 25Mg nuclei". Iraqi Journal of Physics (IJP) 15, nr 33 (8.01.2019): 101–10. http://dx.doi.org/10.30723/ijp.v15i33.146.

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An effective two-body density operator for point nucleon system folded with two-body correlation functions, which take account of the effect of the strong short range repulsion and the strong tensor force in the nucleon-nucleon forces, is produced and used to derive an explicit form for ground state two-body charge density distributions (2BCDD's) and elastic electron scattering form factors F (q) for 19F, 27Al and 25Mg nuclei. It is found that the inclusion of the two-body short range correlations (SRC) has the feature of reducing the central part of the 2BCDD's significantly and increasing the tail part of them slightly, i.e. it tends to increase the probability of transferring the protons from the central region of the nucleus towards its surface and to increase the root mean square charge radius ˂ r 2˃ 1/2 of the nucleus and then makes the nucleus to be less rigid than the case when there is no (SRC). It is also found that the effects of two body tensor correlations (TCs) on 2BCDD's and ˂ r 2˃ 1/2 are in opposite direction to those of (SRC).

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39

Avramov, P. V., i S. G. Ovchinnikov. "Strong electron correlation effects in X-ray and photoelectron spectra of high-temperature superconductors". Journal of Structural Chemistry 40, nr 1 (styczeń 1999): 108–51. http://dx.doi.org/10.1007/bf02700786.

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40

Beznosjuk, S. A., B. F. Minaev, R. D. Dajanov i Z. M. Muldakhmetov. "Approximating quasi-particle density functional calculations of small active clusters: Strong electron correlation effects". International Journal of Quantum Chemistry 38, nr 6 (grudzień 1990): 779–97. http://dx.doi.org/10.1002/qua.560380603.

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TSUI, D. C. "CORRELATION AND LOCALIZATION OF TWO-DIMENSIONAL ELECTRONS IN A STRONG MAGNETIC FIELD". Modern Physics Letters B 04, nr 05 (10.03.1990): 301–10. http://dx.doi.org/10.1142/s0217984990000386.

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This paper gives a brief review of some recent experiments on the localization-delocalization transition in the integral quantum Hall effect and the new quantum liquid ground states giving rise to the fractional quantum Hall effect.

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Di Castro, C., M. Grilli i S. Caprara. "Strong correlation, electron–phonon interaction and critical fluctuations: isotope effect, pseudogap formation, and phase diagram of the cuprates". Journal of Physics and Chemistry of Solids 63, nr 12 (grudzień 2002): 2219–24. http://dx.doi.org/10.1016/s0022-3697(02)00234-2.

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Gerber, S., S. L. Yang, D. Zhu, H. Soifer, J. A. Sobota, S. Rebec, J. J. Lee i in. "Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser". Science 357, nr 6346 (6.07.2017): 71–75. http://dx.doi.org/10.1126/science.aak9946.

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The interactions that lead to the emergence of superconductivity in iron-based materials remain a subject of debate. It has been suggested that electron-electron correlations enhance electron-phonon coupling in iron selenide (FeSe) and related pnictides, but direct experimental verification has been lacking. Here we show that the electron-phonon coupling strength in FeSe can be quantified by combining two time-domain experiments into a “coherent lock-in” measurement in the terahertz regime. X-ray diffraction tracks the light-induced femtosecond coherent lattice motion at a single phonon frequency, and photoemission monitors the subsequent coherent changes in the electronic band structure. Comparison with theory reveals a strong enhancement of the coupling strength in FeSe owing to correlation effects. Given that the electron-phonon coupling affects superconductivity exponentially, this enhancement highlights the importance of the cooperative interplay between electron-electron and electron-phonon interactions.

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Zhang, Tian-Cheng, Gao-Yuan Pan, You-Jun Yu, Chen-Zhong Dong i Xiao-Bin Ding. "Ionization energy and valence electron orbital binding energy of superheavy element Og(<i>Z</i> = 118) and its homologs". Acta Physica Sinica 71, nr 21 (2022): 213201. http://dx.doi.org/10.7498/aps.71.20220813.

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The ionization energy of the superheavy element Og (<i>Z</i> = 118) and its homolog elements Ar, Kr, Xe, Rn, and their ions are systematically calculated by using the GRASP2K program based on the multi-configuration Dirac-Hartree-Fock (MCDHF) method, taking into account relativistic effects, electron correlation effects between valence shell electrons, quantum electrodynamics effects, and Breit interaction. To reduce the uncertainty of the ionization energy derived from electron correlation effects which are not fully considered, the ionization potential of the superheavy element Og<sup>0–2+</sup> and its homolog element Rn<sup>0–2+</sup> are extrapolated by the extrapolation method. The ionization energy of extrapolated Rn<sup>0–5+</sup> and Og<sup>5+</sup> coincide well with experimental and other theoretical values. These results can be used to predict the unknown physical and chemical properties of the atoms and compounds of the superheavy element Og. In addition, the calculation results of the electron orbital binding energy of the atomic valence shell of the superheavy element Og and its homolog elements Ar, Kr, Xe, and Rn under relativistic and non-relativistic conditions show that owing to the relativistic effect, there occur strong orbital contraction phenomena in the 7s orbital and 7p<sub>1/2</sub> orbital and strong splitting phenomena in the 7p<sub>1/2 </sub> orbital and 7p<sub>3/2</sub> orbital of Og, which may cause the physical and chemical properties of the superheavy element Og to differ from those of other homologs.

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Lin, Jiang-Xiazi, Ya-Hui Zhang, Erin Morissette, Zhi Wang, Song Liu, Daniel Rhodes, K. Watanabe, T. Taniguchi, James Hone i J. I. A. Li. "Spin-orbit–driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene". Science 375, nr 6579 (28.01.2022): 437–41. http://dx.doi.org/10.1126/science.abh2889.

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Strong electron correlation and spin-orbit coupling (SOC) can have a profound influence on the electronic properties of materials. We examined their combined influence on a two-dimensional electronic system at the atomic interface between magic-angle twisted bilayer graphene and a tungsten diselenide crystal. We found that strong electron correlation within the moiré flatband stabilizes correlated insulating states at both quarter and half filling, and that SOC transforms these Mott-like insulators into ferromagnets, as evidenced by a robust anomalous Hall effect with hysteretic switching behavior. The coupling between spin and valley degrees of freedom could be demonstrated through control of the magnetic order with an in-plane magnetic field or a perpendicular electric field. Our findings establish an experimental knob to engineer topological properties of moiré bands in twisted bilayer graphene and related systems.

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Schrange-Kashenock, G. "Inner-shell photodetachment from a Si−negative ion: strong effect of many-electron correlations". Journal of Physics B: Atomic, Molecular and Optical Physics 49, nr 11 (3.05.2016): 115201. http://dx.doi.org/10.1088/0953-4075/49/11/115201.

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Hutasoit, Kennorton, i Henni Gusfa. "The effect of television media on beginner voters’ political participation". Jurnal Studi Komunikasi (Indonesian Journal of Communications Studies) 4, nr 3 (5.11.2020): 583. http://dx.doi.org/10.25139/jsk.v4i3.2432.

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The political participation of beginner voters in the 2019 Indonesian General Elections in Belu Regency, East Nusa Tenggara Province (NTT) differentiate the current research from other studies. The television media were assumed to influence the political participation of beginner voters in the border region. Correlation test (r) was used to uncover the findings of this study. This study revealed a correlation between exposure to television mass media and political participation with 0.623 value, or strong correlation level category. Television media exposure also had a significant influence on political participation in the border district. Therefore, television broadcasting institutions which manage public frequencies play an important role in increasing the political participation of beginner voters at the border district by broadcasting political and election-related contents or programs.

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Capone, M., C. Castellani i M. Grilli. "Electron-Phonon Interaction in Strongly Correlated Systems". Advances in Condensed Matter Physics 2010 (2010): 1–18. http://dx.doi.org/10.1155/2010/920860.

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The Hubbard-Holstein model is a simple model including both electron-phonon interaction and electron-electron correlations. We review a body of theoretical work investigating, the effects of strong correlations on the electron-phonon interaction. We focus on the regime, relevant to high-Tcsuperconductors, in which the electron correlations are dominant. We find that electron-phonon interaction can still have important signatures, even if many anomalies appear, and the overall effect is far from conventional. In particular in the paramagnetic phase the effects of phonons are much reduced in the low-energy properties, while the high-energy physics can still be affected by phonons. Moreover, the electron-phonon interaction can give rise to important effects, like phase separation and charge-ordering, and it assumes a predominance of forward scattering even if the bare interaction is assumed to be local (momentum independent). Antiferromagnetic correlations reduce the screening effects due to electron-electron interactions and revive the electron-phonon effects.

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Ruberti, M., P. Decleva i V. Averbukh. "Multi-channel dynamics in high harmonic generation of aligned CO2: ab initio analysis with time-dependent B-spline algebraic diagrammatic construction". Physical Chemistry Chemical Physics 20, nr 12 (2018): 8311–25. http://dx.doi.org/10.1039/c7cp07849h.

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Ramazani, Ali, Farzaneh Shayeganfar, Jaafar Jalilian i Nicholas X. Fang. "Exciton-plasmon polariton coupling and hot carrier generation in two-dimensional SiB semiconductors: a first-principles study". Nanophotonics 9, nr 2 (25.02.2020): 337–49. http://dx.doi.org/10.1515/nanoph-2019-0363.

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AbstractExciton (strong electron–hole interactions) and hot carriers (HCs) assisted by surface plasmon polaritons show promise to enhance the photoresponse of nanoelectronic and optoelectronic devices. In the current research, we develop a computational quantum framework to study the effect of coupled exciton and HCs on the photovoltaic energy distribution, scattering process, polarizability, and light emission of two-dimensional (2D) semiconductors. Using a stable 2D semiconductor (semihydrogenated SiB) as our example, we theoretically show that external strain and thermal effect on the SiB can lead to valley polarized plasmon quasiparticles and HC generation. Our results reveal that the electron–phonon and electron–electron (e–e) interactions characterize the correlation between the decay rate, scattering of excitons, and generation of HCs in 2D semiconductors. Moreover, phonon assisted luminescence spectra of SiB suggest that light emission can be enhanced by increasing strain and temperature. The polarized plasmon with strong coupling of electronic and photonics states in SiB makes it as a promising candidate for light harvesting, plasmonic photocurrent devices, and quantum information.

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