Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 62: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)
TT 62.7: Talk
Wednesday, March 14, 2018, 17:00–17:15, H 3010
Absence of dynamical localization in interacting driven systems — •David J. Luitz1, Yevgeny Bar Lev2,3, and Achilleas Lazarides3 — 1Physik Department T42, Technische Universität München, Germany — 2Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel — 3Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany
Using a numerically exact method we study the stability of dynamical localization to the addition of interactions in a periodically driven isolated quantum system which conserves only the total number of particles. We find that while even infinitesimally small interactions destroy dynamical localization, for weak interactions density transport is significantly suppressed and is asymptotically diffusive, with a diffusion coefficient proportional to the interaction strength. For systems tuned away from the dynamical localization point, even slightly, transport is dramatically enhanced and within the largest accessible systems sizes a diffusive regime is only pronounced for sufficiently small detunings.
D. J. Luitz, Y. Bar Lev, A. Lazarides, SciPost Phys. 3, 029 (2017)