Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 23: Quantum Dynamics, Decoherence and Quanten Information

DY 23.5: Vortrag

Dienstag, 8. März 2016, 15:00–15:15, H48

Simulation of Heat Transfer in Quantum Chains Far From Equilibrium — •Thomas Motz, Joachim Ankerhold, and Jürgen T. Stockburger — Institute for Complex Quantum Systems, Ulm University, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

We study heat exchange in open harmonic quantum chains by means of a scalable method also for large system sizes and long relaxation times. Starting from a stochastic Liouville-von Neumann equation that models the coupling of systems to quantum reservoirs by an exact c-number representation [1], we turn this approach to a deterministic set of equations correctly accounting for system-bath correlations for any combinations of harmonic systems arbitrarily strong coupled to ohmic reservoirs [2].

We investigate the time-dependence of the energy fluxes and the corresponding steady-states for various couplings, dampings and temperatures [3,4]. A distinct sensitivity of the fluxes with respect to couplings and impurities is found while correlations reveal a ballistic behavior and recurrence effects for a mismatch of coupling strengths and damping.

[1] J. T. Stockburger and H. Grabert, PRL 88, 170407 (2002).

[2] J. Ankerhold and J. P. Pekola, PRB 90, 075421 (2014).

[3] R. Schmidt et al., PRL 107, 130404 (2011).

[4] R. Schmidt et al., PRA 88, 052321 (2013).