Motif magnetism and quantum many-body scars

TL;DR

This paper introduces a generalized family of spin Hamiltonians with 'spiral colored' eigenstates that can host quantum many-body scars, leading to observable periodic revivals in various lattice geometries.

Contribution

It extends previous models by creating a broader class of Hamiltonians with scar states, applicable to diverse lattice structures, and demonstrates their potential for experimental observation.

Findings

Models exhibit quantum many-body scars with periodic revivals.

Numerical evidence supports the presence of scar states in these models.

Applicable to various lattice geometries like triangular and kagome.

Abstract

We generally expect quantum systems to thermalize and satisfy the eigenstate thermalization hypothesis (ETH), which states that finite energy density eigenstates are thermal. However, some systems, such as many-body localized systems and systems with quantum many-body scars, violate ETH and have high-energy athermal eigenstates. In systems with scars, most eigenstates thermalize, but a few atypical scar states do not. Scar states can give rise to a periodic revival when time-evolving particular initial product states, which can be detected experimentally. Recently, a family of spin Hamiltonians was found with magnetically ordered 3-colored eigenstates that are quantum many-body scars [Lee et al. Phys. Rev. B 101, 241111(2020)]. These models can be realized in any lattice that can be tiled by triangles, such as the triangular or kagome lattices, and have been shown to have close connections to the physics of quantum spin liquids in the Heisenberg kagome antiferromagnet. In this work, we introduce a generalized family of $n$-colored Hamiltonians with "spiral colored" eigenstates made from $n$-spin motifs such as polygons or polyhedra. We show how these models can be realized in many different lattice geometries and provide numerical evidence that they can exhibit quantum many-body scars with periodic revivals that can be observed by time-evolving simple product states. The simple structure of these Hamiltonians makes them promising candidates for future experimental studies of quantum many-body scars.