Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.18: Poster

Thursday, March 15, 2018, 15:00–19:00, Poster B

Universal short-time response and formation of collective mode — •Klaus Morawetz — Münster University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — International Institute of Physics- UFRN,Campus Universitário Lagoa nova,59078-970 Natal, Brazil — Max-Planck- Institute for the Physics of Complex Systems, 01187 Dresden, Germany

The short-time response of two distinct systems, the pump and probe experiments with a semiconductor and the sudden quench of cold atoms in an optical lattice, are found to be described by the same universal function. This analytic formula at short time scales is derived from the quantum kinetic-theory approach observing that correlations need time to form. The influence of the finite-trapping potential is derived and discussed along with Singwi-Sjølander local-field corrections including the proof of sum rules. The quantum kinetic equation allows to understand how two-particle correlations are formed and how the screening and collective modes are build up.
Phys. Rev. B 90 (2014) 075303
Phys. Rev. E 66 (2002) 022103
Phys. Rev. E 63 (2001) 20102
Phys. Lett. A 246 (1998) 311