Correspondence principle for many-body scars in ultracold Rydberg atoms

• URL: http://arxiv.org/abs/2006.13207v2
• Date: Wed, 3 Mar 2021 14:31:07 GMT
• Title: Correspondence principle for many-body scars in ultracold Rydberg atoms
• Authors: Christopher J. Turner, Jean-Yves Desaules, Kieran Bull, and Zlatko Papi\'c
• Abstract summary: Recently, interest in quantum scars has been revived in a many-body setting of Rydberg atom chains. We show that quasimodes arise from a "requantisation" of previously established periodic orbits when quantum fluctuations are restored to all orders. Our results shed light on the TDVP classical system simultaneously playing the role of both the mean-field approximation and the system's classical limit.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The theory of quantum scarring -- a remarkable violation of quantum unique ergodicity -- rests on two complementary pillars: the existence of unstable classical periodic orbits and the so-called quasimodes, i.e., the non-ergodic states that strongly overlap with a small number of the system's eigenstates. Recently, interest in quantum scars has been revived in a many-body setting of Rydberg atom chains. While previous theoretical works have identified periodic orbits for such systems using time-dependent variational principle (TDVP), the link between periodic orbits and quasimodes has been missing. Here we provide a conceptually simple analytic construction of quasimodes for the non-integrable Rydberg atom model, and prove that they arise from a "requantisation" of previously established periodic orbits when quantum fluctuations are restored to all orders. Our results shed light on the TDVP classical system simultaneously playing the role of both the mean-field approximation and the system's classical limit, thus allowing us to firm up the analogy between the eigenstate scarring in the Rydberg atom chains and the single-particle quantum systems.

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