Literatura científica selecionada sobre o tema "Keldysha"
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Artigos de revistas sobre o assunto "Keldysha"
Radovskaya, A. A., e A. G. Semenov. "Lokal'nyy kvench v tekhnike Keldysha". Письма в Журнал экспериментальной и теоретической физики 118, n.º 11-12 (12) (15 de dezembro de 2023): 921–27. http://dx.doi.org/10.31857/s1234567823240096.
Texto completo da fontePopov, Vladimir S. "Tunnel and multiphoton ionization of atoms and ions in a strong laser field (Keldysh theory)". Uspekhi Fizicheskih Nauk 174, n.º 9 (2004): 921. http://dx.doi.org/10.3367/ufnr.0174.200409a.0921.
Texto completo da fonteCapasso, Federico, Paul Corkum, Olga Kocharovskaya, Lev Pitaevskii e Michael V. Sadovskii. "Leonid Keldysh". Physics Today 70, n.º 6 (junho de 2017): 75–76. http://dx.doi.org/10.1063/pt.3.3605.
Texto completo da fonteGaliautdinov, Andrei. "Anisotropic Keldysh interaction". Physics Letters A 383, n.º 25 (setembro de 2019): 3167–74. http://dx.doi.org/10.1016/j.physleta.2019.07.002.
Texto completo da fontePolilova, Tatyana Alekseevna. "Keldysh Institute Preprints in the diagrams of the Science Space system". Keldysh Institute Preprints, n.º 27 (2022): 1–38. http://dx.doi.org/10.20948/prepr-2022-27.
Texto completo da fonteAndreev, Aleksandr F., N. G. Basov, Vitalii L. Ginzburg, Aleksandr V. Gurevich, Boris B. Kadomtsev, D. A. Kirzhnits, Yurii V. Kopaev et al. "Leonid Veniaminovich Keldysh (On his sixtieth birthday)". Uspekhi Fizicheskih Nauk 161, n.º 4 (1991): 179. http://dx.doi.org/10.3367/ufnr.0161.199104h.0179.
Texto completo da fonteVolkov, Boris A., Aleksandr V. Gurevich, Vitalii L. Ginzburg, Yurii V. Kopaev, Oleg N. Krokhin, Vladimir I. Ritus, Viktor P. Silin, V. Ya Fainberg, Evgenii L. Feinberg e Dmitrii S. Chernavskii. "Leonid Veniaminovich Keldysh (on his seventieth birthday)". Uspekhi Fizicheskih Nauk 171, n.º 4 (2001): 435. http://dx.doi.org/10.3367/ufnr.0171.200104e.0435.
Texto completo da fonteBauer, Jarosław H. "Keldysh theory re-examined". Journal of Physics B: Atomic, Molecular and Optical Physics 49, n.º 14 (15 de junho de 2016): 145601. http://dx.doi.org/10.1088/0953-4075/49/14/145601.
Texto completo da fonteJauho, A. P., e K. Johnsen. "Dynamical Franz-Keldysh Effect". Physical Review Letters 76, n.º 24 (10 de junho de 1996): 4576–79. http://dx.doi.org/10.1103/physrevlett.76.4576.
Texto completo da fonteTrunin, Dmitrii A. "Comments on the adiabatic theorem". International Journal of Modern Physics A 33, n.º 24 (30 de agosto de 2018): 1850140. http://dx.doi.org/10.1142/s0217751x18501403.
Texto completo da fonteTeses / dissertações sobre o assunto "Keldysha"
Leeson, Mark Stephen. "Franz-Keldysh effect planar optical modulators". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334205.
Texto completo da fonteDesplanque, Ludovic. "Caractérisation électro-optique de composants térahertz par échantillonnage Franz-Keldysh subpicoseconde". Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2003. http://tel.archives-ouvertes.fr/tel-00012147.
Texto completo da fonteLes méthodes d'échantillonnage électro-optique basées sur l'utilisation d'un laser impulsionnel femtoseconde constituent une méthode alternative de caractérisation hyperfréquences. Ces mesures dont la résolution temporelle peut être inférieure à la picoseconde permettent d'étudier la réponse en fréquence de composants intégrés jusqu'à plus de 1 THz.
La méthode d'échantillonnage ultra-rapide que nous proposons est basée sur un effet d'électroabsorption présent dans de nombreux semiconducteurs massifs : l'effet Franz-Keldysh. Cet effet nous permet de sonder optiquement des impulsions électriques ultra-brèves se propageant sur une ligne de transmission déposée sur Arséniure de Gallium (GaAs). Ces impulsions sont également générées par voie optique grâce à un matériau photoconducteur ultra-rapide : le GaAs épitaxié à basse température.
La démonstration expérimentale de cette méthode de caractérisation est tout d'abord effectuée en utilisant les propriétés intrinsèques du substrat semiconducteur. Dans un deuxième temps, des améliorations technologiques sont apportées au dispositif expérimental pour permettre une généralisation de la technique de mesure à tout type de substrat. Pour cela, nous avons en particulier mis au point une technique de « lift-off » épitaxial permettant le report des matériaux nécessaires à la mesure sur un circuit ayant déjà subi les étapes technologiques. Ces différentes méthodes de mesure sont ensuite appliquées à la caractérisation de lignes de transmission ou de composants passifs THz. Elles ont permis entre autre la mise en évidence du phénomène de couplage par onde de choc électromagnétique entre deux lignes de transmission coplanaires, ou l'évaluation des paramètres S d'un filtre réjecteur de Bragg intégré sur substrat de quartz jusqu'à 1,2 THz. Enfin, la possibilité d'étudier un transistor bipolaire à hétérojonction à doigt d'émetteur submicronique par cette technique de mesure est envisagée.
Nakata, Kouki. "Non-Equilibrium Quantum Spin Transport Theory Based on Schwinger-Keldysh Formalism". 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188467.
Texto completo da fonteSouza, Fabricio Macedo de. "Transporte quântico em spintrônica: corrente e shot noise via funções de Green de não equilíbrio". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-26112008-143946/.
Texto completo da fonteWe study spin dependent quantum transport in quantum dots and quantum well devices attached to magnetic leads. We first derive general formulas, including electron-electron interaction and spin flip, for both current and noise, using the no equilibrium Green function technique (Keldysh). From our equations we regain limiting cases in the literature - in particular the Landauer-Buttiker formula when we neglect electron-electron interaction. We apply these formulas to study three distinct systems: (1) a quantum dot attached to two ferromagnetic leads, (2) a quantum dot linked to many ferromagnetic leads, and (3) a quantum well coupled to dilute magnetic semiconductor (DMS) terminals. In the first system we consider both parallel (P) and anti-parallel (AP) ferromagnetic alignments of the leads. Coulomb interaction and spin flip scattering are also taken into account. With the formulas for the current and the noise derived here, we find, for instance, that the Coulomb interaction, combined with the magnetism of the electrodes, gives rise to a spin-dependent Coulomb blockade. This effect allows the control (intensity and sign) of the current polarization via the bias voltage. We also observe that spin flip scattering yields contrasting behavior between current and shot noise. While the current in the AP configuration increases with the spin flip, the shot noise becomes suppressed for a range of spin flip rates. Another interesting finding is the possibility to suppress the thermal noise via a gate voltage. For the dot coupled to three magnetic leads, we show that it is possible to inject current ↑-polarized into the dot from the FM emitter, detect simultaneously ↑ and ↓ - polarized currents at distinct collectors. In addition, we find that the current has its polarization amplified when going from the emitter to one of the collectors. Therefore we have a device that operates as both as current polarization inverter and amplifier. Finally, we analyze the effects of DMS leads and Landau quantization on the current and noise of system (3). We and that the giant Zeeman effect in the DMS leads, due to the it s-d exchange interaction, gives rise to a spin polarized current, and for a particular bias voltage range, full suppression of one spin component. This gives rise to the possibility of tuning the current polarization via the bias voltage. We also observe oscillations in the current, the noise and the Fano factor as a function of the magnetic field.
Lima, Leandro Romão Fernandes. "Aplicações do formalismo de Keldysh ao transporte e ao bombeamento de calor em nanoestruturas". Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6304.
Texto completo da fonteNum regime balísstico e a baixas temperaturas, a fórmula de Landauer dá uma boa descrição do transporte de calor para nano-junções conectadas a dois fios acoplados a banhos térmicos a temperaturas diferentes. Partindo de um modelo microscópico e utilizando o método de funções de Green fora do equilíbrio, é possível obter uma expressão para a condutância térmica na nano-junção equivalente a fórmula de Landauer. Esta depende dos valores das constantes de acoplamento entre os modos de fônons da região central e dos fios, além do gradiente térmico. A expressão para a condutância térmica é muito semelhante aquela obtida para a condutância elétrica. Neste trabalho nós apresentamos o método para o cálculo de grandezas relacionadas ao transporte térmico em um regime onde não há um gradiente de temperatura entre os reservatórios mas o sistema sofre uma perturbação dependente do tempo. Ou seja, com uma escolha conveniente da parametrização temporal dos termos de acoplamento entre a nano-junção e os fios é possível produzir uma corrente de calor na ausência de diferença de temperaturas entre os banhos térmicos aos quais os fios estão conectados. Esse fenômeno caracteriza o bombeamento de calor. Desenvolvemos uma teoria de transporte dependente do tempo para descrever o bombeamento. A teoria é geral, dependendo da densidade de fônons, da intensidade e dependência temporal do acoplamento. Aplicamos o formalismo em um modelo simples demonstrando que, em princípio, é possível bombear calor através de uma cadeia linear de átomos sem gradiente térmico.
In the ballistic regime at low temperatures, the Landauer formula gives a good description of heat transport for nano-junctions, connected to two leads attached to thermal baths at different temperatures. Starting from a microscopic model and using the nonequilibrium Green functions, it is possible to obtain an expression for the thermal conductance in nano-junction equivalent to the Landauer formula. The latest depends on the values of the coupling constants between phonon modes of the central region and leads, as well as on the thermal gradient. The expression for the thermal conductance is quite similar to that obtained for electrical conductance. In this work we present the method to calculate quantities related to heat transport in a regime where there is no temperature gradient between the reservoirs, but the system suffers a time depending perturbation. That is, with a convenient choice of time parameterization of the coupling terms between the nano-junction and the leads it is possible to produce a heat flow in the absence of a temperature difference between the thermal baths connected to the leads. This phenomenon characterizes the heat pumping. We develop a time-dependent transport theory to describe the pumping. The theory is general, depending on the phonons density, intensity and time dependence of the coupling. We apply the formalism in a simple model showing that in principle it is possible to pump heat through a linear chain of atoms without thermal gradient.
Schmidt, Christian [Verfasser]. "Transiente Hochfeldeffekte im Volumenhalbleiter Galliumarsenid : Von der Franz-Keldysh-Absorption zur Wannier-Stark-Lokalisierung / Christian Schmidt". Konstanz : Bibliothek der Universität Konstanz, 2016. http://d-nb.info/1137835648/34.
Texto completo da fonteSouquet, Jean-René. "Transport dans les nanostructures quantiques". Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01010433.
Texto completo da fonteDobrescu, Bogdan E. "Production of bosonic molecules in the nonequilibrium dynamics of a degenerate Fermi gas across a Feshbach resonance". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1838.
Texto completo da fonteSohns, Joachim. "Modellierung von Transportprozessen in Alkaligläsern". [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-66128.
Texto completo da fonteClaveau, Yann. "Modeling of ballistic electron emission microscopy". Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S074/document.
Texto completo da fonteAfter the discovery of Giant Magneto-Resistance (GMR) by Albert Fert and Peter Grünberg, electronics had a breakthrough with the birth of a new branch called spintronics. This discipline, while still young, exploit the spin of electrons, for instance to store digital information. Most quantum devices exploiting this property of electrons consist of alternating magnetic and nonmagnetic thin layers on a semiconductor substrate. One of the best tools used for characterizing these structures, invented in 1988 by Kaiser and Bell, is the so-called Ballistic Electron Emission Microscope (BEEM). Originally, this microscope, derived from the scanning tunneling microscope (STM), was dedicated to the imaging of buried (nanometer-scale) objects and to the study of the potential barrier (Schottky barrier) formed at the interface of a metal and a semiconductor when placed in contact. With the development of spintronics, the BEEM became an essential spectroscopy technique but still fundamentally misunderstood. It was in 1996 that the first realistic model, based on the non-equilibrium Keldysh formalism, was proposed to describe the transport of electrons during BEEM experiments. In particular, this model allowed to explain some experimental results previously misunderstood. However, despite its success, its use was limited to the study of semi-infinite structures through a calculation method called decimation of Green functions. In this context, we have extended this model to the case of thin films and hetero-structures like spin valves: starting from the same postulate that electrons follow the band structure of materials in which they propagate, we have established an iterative formula allowing calculation of the Green functions of the finite system by tight-binding method. This calculation of Green’s functions has been encoded in a FORTRAN 90 program, BEEM v3, in order to calculate the BEEM current and the surface density of states. In parallel, we have developed a simpler method which allows to avoid passing through the non-equilibrium Keldysh formalism. Despite its simplicity, we have shown that this intuitive approach gives some physical interpretation qualitatively similar to the non-equilibrium approach. However, for a more detailed study, the use of “non-equilibrium approach” is inevitable, especially for the detection of thickness effects linked to layer interfaces. We hope these both tools should be useful to experimentalists, especially for the Surfaces and Interfaces team of our department
Livros sobre o assunto "Keldysha"
Kozʹmenko, M. V., e V. M. Vvedenskai︠a︡. "Slozhnai︠a︡ t︠s︡elostnostʹ" literatury: Issledovanii︠a︡ i publikat︠s︡ii : k i︠u︡bilei︠u︡ V.A. Keldysha. Moskva: IMLI RAN, 2019.
Encontre o texto completo da fonteBegieva-Kuchmezova, R. Svet zvezdy i svechi...: K 90-letii︠u︡ Timura Magometovicha Ėneeva. Moskva: IPM imeni M.V. Keldysha RAN, 2015.
Encontre o texto completo da fonteA, Keldysh V., Lekmanov O. A, Polonskiĭ V. V e Institut mirovoĭ literatury imeni A.M. Gorʹkogo., eds. Russkai︠a︡ literatura kont︠s︡a XIX-nachala XX veka v zerkale sovremennoĭ nauki: V chestʹ V.A. Keldysha : issledovanii︠a︡ i publikat︠s︡ii. Moskva: IMLI RAN, 2008.
Encontre o texto completo da fonteTeterina, N. I. I︠U︡riĭ Vsevolodovich Keldysh: Vospominanii︠a︡, issledovanii︠a︡, materialy, dokumenty. Moskva: Gosudarstvennyĭ institut iskusstvoznanii︠a︡, 2015.
Encontre o texto completo da fonteV, Zabrodin A., ed. M.V. Keldysh: Tvorcheskiĭ portret po vospominanii︠a︡m sovremennikov. Moskva: Nauka, 2002.
Encontre o texto completo da fonteSvishchëv, G. P. Vydai︠u︡shchiesi︠a︡ mekhaniki: N.E. Zhukovskiĭ, S.A. Chaplygin, M.V. Keldysh. Moskva: T︠S︡entr. aėrogidrodinamicheskiĭ in-t im. N.E. Zhukovskogo, 1996.
Encontre o texto completo da fonteOtway, Thomas H. The Dirichlet Problem for Elliptic-Hyperbolic Equations of Keldysh Type. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24415-5.
Texto completo da fonteLake, Roger Kevin. Application of the keldysh formalism to quantum device modeling and analysis. Ann Arbor, Michigan: UMI, 2002.
Encontre o texto completo da fonteChernavskiĭ, A. V. Geometric topology and set theory: Collected papers dedicated to the 100th birthday of professor Lyudmila Vsevolodovna Keldysh. Moscow: Maik Nauka/Interperiodica, 2004.
Encontre o texto completo da fonteV, Chernavskiĭ A., ed. Geometric topology and set theory: Collected papers dedicated to the 100th birthday of professor Lyudmila Vsevolodovna Keldysh. Moscow: Maik Nauka/Interperiodica, 2004.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Keldysha"
Gurshtein, Alexander A. "Keldysh, Mstislav Vsevolodovich". In Biographical Encyclopedia of Astronomers, 1174. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-9917-7_9311.
Texto completo da fonteBiró, Tamás Sándor, e Antal Jakovác. "Keldysh (Two-Time) Formalism". In SpringerBriefs in Physics, 35–50. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11689-7_3.
Texto completo da fontevan Leeuwen, R., N. E. Dahlen, G. Stefanucci, C. O. Almbladh e U. von Barth. "Introduction to the Keldysh Formalism". In Time-Dependent Density Functional Theory, 33–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-35426-3_3.
Texto completo da fonteDatta, S. "Keldysh Formalism and the Landauer Approach". In Physics of Low-Dimensional Semiconductor Structures, 299–331. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-2415-5_8.
Texto completo da fonteMilton, Kimball A. "Time-Cycle or Schwinger-Keldysh Formulation". In SpringerBriefs in Physics, 51–61. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20128-3_5.
Texto completo da fonteGinzburg, Vitaly L. "Mstislav Vsevoldovich Keldysh (A Detached View)". In The Physics of a Lifetime, 425–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04455-1_24.
Texto completo da fonteMerino, Jaime, e Alfredo Levy Yeyati. "Introduction to Non-equilibrium: The Keldysh Contour". In UNITEXT for Physics, 97–100. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55143-7_7.
Texto completo da fonteKamenev, Alex. "Keldysh and DOI-Peliti Techniques for Out-of-Equilibrium Systems". In Strongly Correlated Fermions and Bosons in Low-Dimensional Disordered Systems, 313–40. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0530-2_13.
Texto completo da fonteReiss, H. R. "The Keldysh Theory of Strong Field Ionization and its Extensions". In Atoms in Strong Fields, 425–46. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9334-5_22.
Texto completo da fonteEckstein, Martin. "From the Keldysh Formalism to Non-equilibrium Dynamical Mean-Field Theory". In Out-of-Equilibrium Physics of Correlated Electron Systems, 61–119. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94956-7_3.
Texto completo da fonteTrabalhos de conferências sobre o assunto "Keldysha"
Leonov, Gennady A., e Nikolay V. Kuznetsov. "On the Keldysh problem of flutter suppression". In THE EIGHTH POLYAKHOV’S READING: Proceedings of the International Scientific Conference on Mechanics. Author(s), 2018. http://dx.doi.org/10.1063/1.5034578.
Texto completo da fonteHoshina, Hiroki, Hirotsugu Fujii e Yoshio Kikukawa. "Schwinger-Keldysh formalism for Lattice Gauge Theories". In 37th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.363.0190.
Texto completo da fonteSarid, Dror, e Wayne M. Gibbons. "Temporal response of the Franz-Keldysh effect". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.we5.
Texto completo da fonteChang, Guo-En. "Analysis of Franz-Keldysh Effect in GeSn Alloys". In 2019 IEEE Photonics Society Summer Topical Meeting Series (SUM). IEEE, 2019. http://dx.doi.org/10.1109/phosst.2019.8794967.
Texto completo da fonteHughes, S., e D. S. Citrin. "Dynamical Franz-Keldysh Effect in the terahertz regime". In Radiative Processes and Dephasing in Semiconductors. Washington, D.C.: OSA, 1998. http://dx.doi.org/10.1364/rpds.1998.rmd7.
Texto completo da fonteFreericks, J. K., V. Turkowski e V. Zlatic. "Parallelizing the Keldysh formalism for strongly correlated electrons". In Proceedings. Users Group Conference. IEEE, 2004. http://dx.doi.org/10.1109/dod_ugc.2004.32.
Texto completo da fonteGruzdev, Vitali E. "Laser-induced ionization of solids: back to Keldysh". In Boulder Damage Symposium XXXVI, editado por Gregory J. Exarhos, Arthur H. Guenther, Norbert Kaiser, Keith L. Lewis, M. J. Soileau e Christopher J. Stolz. SPIE, 2005. http://dx.doi.org/10.1117/12.578469.
Texto completo da fonteWeiser, Gerhard, A. Horvath e H. J. Kolbe. "Franz-Keldysh effect of band states in polydiacetylene". In Optical Science, Engineering and Instrumentation '97, editado por Z. Valy Vardeny e Lewis J. Rothberg. SPIE, 1997. http://dx.doi.org/10.1117/12.279276.
Texto completo da fonteLucchini, Matteo, Shunsuke A. Sato, Giacinto D. Lucarelli, Bruno Moio, Giacomo Inzani, Rocío Borrego-Varillas, Fabio Frassetto et al. "Attosecond Dynamical Franz-Keldysh Effect in Core Excitons". In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/up.2020.w1a.1.
Texto completo da fonteAbadia, N., S. Olivier, D. Marris-Morini, L. Vivien, T. Bernadin e J. C. Weeber. "A CMOS-compatible Franz-Keldysh effect plasmonic modulator". In 2014 IEEE 11th International Conference on Group IV Photonics. IEEE, 2014. http://dx.doi.org/10.1109/group4.2014.6962021.
Texto completo da fonte