Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 62: CE: Low-dimensional Systems - Models 2

TT 62.8: Vortrag

Freitag, 18. März 2011, 12:30–12:45, HSZ 105

Relaxation dynamics of an exactly solvable electron-phonon model — •Dante Marvin Kennes and Volker Meden — Institut für Theoretische Physik A and JARA-Fundamentals of Future Information Technology, RWTH Aachen University, 52056 Aachen, Germany

We address the question whether observables of an exactly solvable model of electrons coupled to (optical) phonons relax into large time stationary state values and investigate if the asymptotic expectation values can be computed using a stationary density matrix. A sudden quench of the electron-phonon coupling, starting from the noninteracting canonical equilibrium at temperature T in the electron as well as in the phonon subsystems is considered as well as a setup being given by the product of the phonon vacuum and the filled Fermi sea supplemented by a highly excited additional electron. In accordance with earlier studies of such type of models we find that expectation values which become stationary can be described by the density matrix of a generalized Gibbs ensemble which differs from that of a canonical ensemble.