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Geometric quench in the fractional quantum Hall effect: Exact solution in quantum Hall matrix models and comparison with bimetric theory

Journal Article · · Physical Review. B
 [1];  [2];  [3]
  1. Univ. of Chicago, IL (United States). Kadanoff Center for Theoretical Physics
  2. Univ. of Chicago, IL (United States). Kadanoff; Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States). Inst. for Condensed Matter Theory
In this work, we investigate the recently introduced geometric quench protocol for fractional quantum Hall (FQH) states within the framework of exactly solvable quantum Hall matrix models. In the geometric quench protocol, a FQH state is subjected to a sudden change in the ambient geometry, which introduces anisotropy into the system. We formulate this quench in the matrix models and then we solve exactly for the postquench dynamics of the system and the quantum fidelity (Loschmidt echo) of the postquench state. Next, we explain how to define a spin-2 collective variable g'ab (t) in the matrix models, and we show that for a weak quench (small anisotropy), the dynamics of g'ab (t) agrees with the dynamics of the intrinsic metric governed by the recently discussed bimetric theory of FQH states. We also find a modification of the bimetric theory such that the predictions of the modified bimetric theory agree with those of the matrix model for arbitrarily strong quenches. Finally, we introduce a class of higher-spin collective variables for the matrix model, which are related to generators of the W algebra, and we show that the geometric quench induces nontrivial dynamics for these variables.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1656499
Alternate ID(s):
OSTI ID: 1493853
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 99; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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