Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Quantum Chaos (joint session DY/TT)

TT 44.5: Vortrag

Mittwoch, 18. März 2020, 16:15–16:30, HÜL 186

Investigations on the spectral density of kicked spin chains — •Felix Meier, Daniel Waltner, Petr Braun, and Thomas Guhr — Fakultät für Physik, Universität Duisburg-Essen, Duisburg, Deutschland

We study the semiclassical description of locally interacting spin chains whose individual constituents are identical to the kicked-top model. The magnetic field inducing the periodically applied kicks is chosen so that the model is quantum mechanically non-integrable for all possible spin representations. The classical analog of the spin chain is a collection of coupled Bloch vectors, whose dynamics is described stroboscopically. The corresponding classical phase space features highly mixed behavior with regular and chaotic motion occuring simultaneously. We investigate the structure of the quantum spectral density for different particle numbers and system parameters, which send the classical analog through a number of bifurcations.