2020/03/31 by Cheng-Ju Lin, Vladimir Calvera, Timothy H. Hsieh · 5 citations
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevb.101.220304
published as Phys. Rev. B 101, 220304 (2020) · 10 pages, 5 figures
arxiv created 2020/06/24 · arxiv updated 2020/07/01
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.