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TT: Fachverband Tiefe Temperaturen

TT 11: Focus Session: Facets of Many-Body Quantum Chaos (organised by Markus Heyl and Klaus Richter) (joint session DY/TT)

TT 11.10: Vortrag

Mittwoch, 29. September 2021, 12:30–12:45, H6

Quantum scars of bosons with correlated hopping — •Ana Hudomal^1,2, Ivana Vasić², Nicolas Regnault^3,4, and Zlatko Papić¹ — ¹School of Physics and Astronomy, University of Leeds, United Kingdom — ²Institute of Physics Belgrade, University of Belgrade, Serbia — ³Joseph Henry Laboratories and Department of Physics, Princeton University, USA — ⁴Laboratoire de Physique de l’École Normale Supérieure, ENS, CNRS, Paris, France

Recent experiments have shown that preparing an array of Rydberg atoms in a certain initial state can lead to unusually slow thermalization and persistent density oscillations [1]. This type of non-ergodic behavior has been attributed to the existence of “quantum many-body scars”, i.e., atypical eigenstates that have high overlaps with a small subset of vectors in the Hilbert space. Periodic dynamics and many-body scars are believed to originate from a “hard” kinetic constraint: due to strong interactions, no two neighbouring Rydberg atoms are both allowed to be excited. Here we propose a realization of quantum many-body scars in a 1D bosonic lattice model with a “soft” constraint: there are no restrictions on the allowed boson states, but the amplitude of a hop depends on the occupancy of the hopping site. We find that this model exhibits similar phenomenology to the Rydberg atom chain, including weakly entangled eigenstates at high energy densities and the presence of a large number of exact zero energy states [2].

[1] H. Bernien et al., Nature 551, 579 (2017).

[2] A. Hudomal et al., Commun. Phys. 3, 99 (2020).