Quantum Many-Body Scar States in Two-Dimensional Rydberg Atom Arrays
Quantum Gases
2020-07-01 v2 Statistical Mechanics
Quantum Physics
Abstract
We find exponentially many exact quantum many-body scar states in a two-dimensional PXP model -- an effective model for a two-dimensional Rydberg atom array in the nearest-neighbor blockade regime. Such scar states are remarkably simple valence bond solids despite being at effectively infinite temperature, and thus strongly violate the eigenstate thermalization hypothesis. Given a particular boundary condition, such eigenstates have integer-valued energies. Moreover, certain charge-density-wave initial states give rise to strong oscillations in the Rydberg excitation density after a quantum quench and tower-like structures in their overlaps with eigenstates.
Cite
@article{arxiv.2003.04516,
title = {Quantum Many-Body Scar States in Two-Dimensional Rydberg Atom Arrays},
author = {Cheng-Ju Lin and Vladimir Calvera and Timothy H. Hsieh},
journal= {arXiv preprint arXiv:2003.04516},
year = {2020}
}
Comments
10 pages, 5 figures