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Positivity of the Spectral Densities of Retarded Floquet Green Functions.
Uhrig, Götz S; Kalthoff, Mona H; Freericks, James K.
Afiliación
  • Uhrig GS; Lehrstuhl für Theoretische Physik I, Technische Universität Dortmund, Otto-Hahn Straße 4, 44221 Dortmund, Germany.
  • Kalthoff MH; Lehrstuhl für Theoretische Physik I, Technische Universität Dortmund, Otto-Hahn Straße 4, 44221 Dortmund, Germany.
  • Freericks JK; Department of Physics, Georgetown University, 37th St. and O St., NW, Washington, DC 20057, USA.
Phys Rev Lett ; 122(13): 130604, 2019 Apr 05.
Article en En | MEDLINE | ID: mdl-31012632
Periodically driven nonequilibrium many-body systems are interesting because they have quasi-energy spectra, which can be tailored by controlling the external driving fields. We derive the general spectral representation of retarded Green functions in the Floquet regime, thereby generalizing the well-known Lehmann representation from equilibrium many-body physics. The derived spectral Floquet representation allows us to prove the non-negativity of spectral densities and to determine exact spectral sum rules, which can be employed to benchmark the accuracy of approximations to the exact Floquet many-body Green functions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos