Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 96: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems II
TT 96.1: Vortrag
Donnerstag, 3. April 2014, 15:00–15:15, HSZ 304
Transient dynamics of open quantum systems — Oleksiy Kashuba1 and •Herbert Schoeller2 — 1Institut fuer Theoretische Physik, TU Dresden — 2Institut fuer Theorie der Statistischen Physik, RWTH Aachen
We present a renormalization group (RG) method which allows for an analytical study of the transient dynamics of open quantum systems on all time scales [1]. Whereas oscillation frequencies and decay rates of exponential time evolution follow from the fixed point positions, the long-time behavior of pre-exponential functions is related to the scaling behavior around the fixed points. We show that certain terms of the RG flow are only cut off by inverse time, which leads to a difference between infrared and ultraviolet scaling. An evaluation for the ohmic spin boson model at weak damping reveals significant deviations from previous predictions in the long-time regime. We propose that weak coupling problems for stationary quantities can in principle turn into strong coupling ones for the determination of the long-time behavior.
O. Kashuba and H. Schoeller, Phys. Rev. B87, 201402(R) (2013)