Regensburg 2022 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 41: Nonequilibrium Quantum Many-Body Systems (joint session TT/DY)
DY 41.4: Talk
Thursday, September 8, 2022, 15:45–16:00, H22
Nonequilibrium non-Markovian steady states in open quantum many-body systems: Persistent oscillations in Heisenberg quantum spin chains — •Regina Finsterhoelzl1, Manuel Katzer2, and Alexander Carmele2 — 1Department of Physics, University of Konstanz, Germany — 2Institute of Theoretical Physics, Technical University Berlin, Germany
We investigate the effect of a non-Markovian, structured reservoir on an open Heisenberg spin chain by applying coherent time-delayed feedback control to it. The structured reservoir couples frequency-dependent to the spin chain and therefore induces a memory, thus the spin chain interacts partially with its own past. We demonstrate that with this new paradigm of a non-Markovian temporal driving scheme, it is possible to generate persistent oscillations within the many-body system and thus induce highly non-trivial states which dynamically store excitation within the chain. These oscillations occur at special points in the stability landscape and persist for different chain lengths and different initial excitations within the chain. We propose a non-invasive partial characterization of the chain by exploiting the fact that the different trapping conditions which arise each relate to specific steady states within the chain.