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Two-dimensional topological order of kinetically constrained quantum particles

机译:动力学约束量子粒子的二维拓扑阶

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摘要

We investigate how imposing kinetic restrictions on quantum particles that would otherwise hop freely on a two-dimensional lattice can lead to topologically ordered states. The kinetically constrained models introduced here are derived as a generalization of strongly interacting particle systems in which hoppings are given by flux-lattice Hamiltonians and may be relevant to optically driven cold-atom systems. After introducing a broad class of models, we focus on particular realizations and show numerically that they exhibit topological order, as witnessed by topological ground-state degeneracies and the quantization of corresponding invariants. These results demonstrate that the correlations responsible for fractional quantum Hall states in lattices can arise in models involving terms other than density-density interactions.
机译:我们研究了对量子粒子强加动力学限制,否则这些量子粒子会在二维晶格上自由跳跃,从而导致拓扑有序的状态。此处引入的动力学约束模型是对强相互作用粒子系统的概括而得出的,在该系统中,跳变由通量晶格哈密顿量给出,并且可能与光学驱动的冷原子系统有关。引入一类广泛的模型后,我们将重点放在特定的实现上,并从数字上证明它们表现出拓扑顺序,这由拓扑基态简并和相应不变量的量化所证明。这些结果表明,在涉及密度-密度相互作用以外的术语的模型中,可能会引起负责晶格中分数量子霍尔态的相关性。

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