Response Function Theory for Many-Body Systems Away from Equilibrium: Conditions of Ultrafast-Time and Ultrasmall-Space Experimental Resolution
Document title: Response Function Theory for Many-Body Systems Away from Equilibrium: Conditions of Ultrafast-Time and Ultrasmall-Space Experimental Resolution
Journal: Brazilian journal of physics
Database: PERIÓDICA
System number: 000385173
ISSN: 0103-9733
Authors: 1
2
2
2
Institutions: 1Pontificia Universidade Catolica de Goias, Departamento de Fisica, Goiania, Goias. Brasil
2Universidade Estadual de Campinas, Instituto de Fisica "Gleb Wataghin", Campinas, Sao Paulo. Brasil
Year:
Season: Feb
Volumen: 45
Number: 1
Pages: 166-193
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract A response function theory and scattering theory applicable to the study of physical properties of systems driven arbitrarily far removed from equilibrium, specialized for dealing with ultrafast processes, and in conditions of space resolution (including the nanometric scale) are presented. The derivation is done in the framework of a Gibbs-style nonequilibrium statistical ensemble formalism. The observable properties are shown to be connected with time- and space-dependent correlation functions out of equilibrium. A generalized fluctuation-dissipation theorem, which relates these correlation functions with generalized susceptibilities, is derived. The method of nonequilibriumthermodynamic Green functions, which proves useful for calculations, is also presented. Two illustrative applications of the formalism, which study optical responses in ultrafast laser spectroscopy and Raman scattering of electrons in III-N semiconductors (of “blue diodes”) driven away from equilibrium by electric fields of moderate to high intensities, are described
Disciplines: Física y astronomía
Keyword: Física de materia condensada,
Semiconductores,
Función de respuesta,
Teoría de dispersión,
Procesos ultrarrápidos
Keyword: Physics and astronomy,
Condensed matter physics,
Semiconductors,
Response function,
Ultrafast processes,
Scattering theory
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