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arXiv 2107.09690cond-mat.str-elquant-ph
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具有子系统对称性的二维量子自旋系统的Hilbert空间碎裂

Hilbert space fragmentation in a 2D quantum spin system with subsystem symmetries

Alexey Khudorozhkov, Apoorv Tiwari, Claudio Chamon, Titus Neupert

摘要:

我们考虑一个二维量子自旋模型与环交换相互作用,具有子系统对称性与保守磁化沿行和列的正方形晶格,这意味着守恒的全球偶极矩。在一定的制度,该模型是不可积的,但违反了本征态热化假设,通过广泛的希尔伯特空间碎片,包括指数数量的惰性子部门与平凡的动态,所产生的动力学约束。虽然子系统的对称性是相当严格的动力学,我们表明,他们不能单独占这么多的惰性状态,即使无限范围的相互作用。我们提出了一个程序,用于构建屏蔽结构,可以分离和解开动态活性区域彼此。值得注意的是,子系统对称性允许屏蔽层的厚度仅取决于相互作用范围,而不是取决于有源区的大小,这与一般偶极守恒系统的情况不同。

英文摘要:

We consider a 2D quantum spin model with ring-exchange interaction that has subsystem symmetries associated to conserved magnetization along rows and columns of a square lattice, which implies the conservation of the global dipole moment. In a certain regime, the model is non-integrable, but violates the eigenstate thermalization hypothesis through an extensive Hilbert space fragmentation, including an exponential number of inert subsectors with trivial dynamics, arising from kinetic constraints. While subsystem symmetries are quite restrictive for the dynamics, we show that they alone cannot account for such a number of inert states, even with infinite-range interactions. We present a procedure for constructing shielding structures that can separate and disentangle dynamically active regions from each other. Notably, subsystem symmetries allow the thickness of the shields to be dependent only on the interaction range rather than on the size of the active regions, unlike in the case of generic dipole-conserving systems.

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