Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B27: Disorder and Localization in AMO Systems I
11:30 AM–2:30 PM,
Monday, March 15, 2021
Sponsoring
Units:
DAMOP DCMP
Chair: Ehud Altman, University of California, Berkeley
Abstract: B27.00009 : Fluctuation-dissipation relations as an experimentally accessible indicator for thermalization of disordered quantum spin systems*
1:30 PM–1:42 PM
Live
Presenter:
Adrian Braemer
(University Heidelberg)
Authors:
Adrian Braemer
(University Heidelberg)
Martin Gaerttner
(University Heidelberg)
Non-integrable closed quantum systems are generally expected to thermalize in the sense that local observables take thermal ensemble values in the long-time limit. In disordered systems striking exceptions to this behavior, such as many-body localized phases, can occur. A sufficient condition for the approach to thermal equilibrium is eigenstate thermalization, which is, however, hard to check experimentally. Eigenstate thermalization implies that fluctuation-dissipation relations (FDR) should hold, relating the system's thermal fluctuations with how perturbations on the system dissipate. FDRs are experimentally accessible through response measurements and may offer a measurable indicator for thermalization. In this talk, we present numerical results on the validity FDRs in disordered quantum spin systems and discuss experimental protocols for measuring them. The concrete system under consideration is a Rydberg spin system, which presents a versatile platform for realizing Heisenberg models of tunable anisotropy and external fields, different geometries, and tunable disorder strength.
*supported by the DFG Collaborative Research Centre "SFB 1225 (ISOQUANT)"
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