Eigenstate thermalization hypothesis in quantum dimer models
Eigenstate thermalization hypothesis in quantum dimer models
复制标题
量子二聚体模型中的本征态热化假说
DOI：
10.1103/physrevb.96.115140
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发表时间：
2017
影响因子：
3.7
通讯作者：
Lan Z
中科院分区：
文献类型：
--
作者：
Lan Z
利用精确对角化方法研究了正方形和三角形格子上量子二聚体模型的本征态热化假设。由于非遍历性的本地板块翻转动力学，希尔伯特空间，这是由高度约束的紧密堆积的二聚体配置，分裂成部门的拓扑不变量的特点。我们发现，这对ETH有重要的影响：我们发现，ETH显然是满足时，每个拓扑部门分别对待，只有中等比例的潜在和动力学项的哈密顿量。相比之下，当光谱被视为一个整体时，ETH在正方形晶格上分解，显然也在三角形晶格上分解。这些结果表明，量子二聚体模型具有有趣的热化动力学。
We use exact diagonalization to study the eigenstate thermalization hypothesis (ETH) in the quantum dimer model on the square and triangular lattices. Due to the nonergodicity of the local plaquette-flip dynamics, the Hilbert space, which consists of highly constrained close-packed dimer configurations, splits into sectors characterized by topological invariants. We show that this has important consequences for ETH: We find that ETH is clearly satisfied only when each topological sector is treated separately, and only for moderate ratios of the potential and kinetic terms in the Hamiltonian. By contrast, when the spectrum is treated as a whole, ETH breaks down on the square lattice and, apparently, also on the triangular lattice. These results demonstrate that quantum dimer models have interesting thermalization dynamics.