Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Nonequilibrium Quantum Many-Body Systems 2
TT 34.4: Vortrag
Dienstag, 2. April 2019, 14:45–15:00, H22
Stabilizing a dissipative discrete time crystal — Leon Droenner1, •Regina Finsterhölzl1, Markus Heyl2, and Alexander Carmele1 — 1Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany
Experimental evidence of time reversal symmetry breaking in many-body Floquet systems has led to the discovery of a new phase of matter out-of-equilibrium, the so called discrete time crystal (DTC) [1]. The DTC shows periodic oscillations with an integer number of the Floquet period. Here, an essential ingredient is random disorder such that the system is many-body localized (MBL) to remain out-of-equilibrium due to the suppression of entanglement growth within the isolated many-body system.
However, in case of an open quantum system, dissipation naturally melts the DTC [2]. To create a stable DTC in the presence of dissipation, we propose to structure the external reservoirs such that non-Markovian effects are non-negligible. Similar to MBL for the isolated system, the idea is to suppress entanglement growth with external degrees of freedom. We show that such feedback dynamics stabilize the DTC and its oscillations become independent of the coupling to the environment.
[1] J. Zhang et al, Nature 543, 217-220 (2017).
[2] A. Lazarides and R. Moessner, Phys. Rev. B 95, 195135 (2017).