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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)