TY - JOUR T1 - Rainbow Scars: From Area to Volume Law Y1 - 2021 A1 - Christopher M. Langlett A1 - Zhi-Cheng Yang A1 - Julia Wildeboer A1 - Alexey V. Gorshkov A1 - Thomas Iadecola A1 - Shenglong Xu AB -

Quantum many-body scars (QMBS) constitute a new quantum dynamical regime in which rare "scarred" eigenstates mediate weak ergodicity breaking. One open question is to understand the most general setting in which these states arise. In this work, we develop a generic construction that embeds a new class of QMBS, rainbow scars, into the spectrum of an arbitrary Hamiltonian. Unlike other examples of QMBS, rainbow scars display extensive bipartite entanglement entropy while retaining a simple entanglement structure. Specifically, the entanglement scaling is volume-law for a random bipartition, while scaling for a fine-tuned bipartition is sub-extensive. When internal symmetries are present, the construction leads to multiple, and even towers of rainbow scars revealed through distinctive non-thermal dynamics. To this end, we provide an experimental road map for realizing rainbow scar states in a Rydberg-atom quantum simulator, leading to coherent oscillations distinct from the strictly sub-volume-law QMBS previously realized in the same system. 

UR - https://arxiv.org/abs/2107.03416 ER -