一维莫尔势诱导的重入拓扑相与自旋密度波
Reentrant topological phases and spin density wave induced by 1D moiré potentials
AI总结：
本研究揭示一维莫尔势可诱导自旋-1/2费米子原子从平凡相到拓扑相的重入转变及周期自旋密度波，并阐明其物理机制与相互作用影响，为超冷原子实验提供新方向。
摘要：
近年来对二维莫尔材料的研究为推进凝聚态物理提供了机遇。然而，一维莫尔势对拓扑相和关联相的影响在很大程度上仍未得到探索。在此，我们揭示了由一维公度莫尔势诱导的、针对自旋-1/2费米子原子的一系列平凡到拓扑的相变以及周期莫尔自旋密度波。这种从平凡相出发的重入拓扑在没有莫尔势的情况下是不存在的，并且可以理解为莫尔强度对拓扑参数的重整化。随后，我们揭示了单粒子本征态的临界指数和局域化性质。多体基态的周期自旋密度波由莫尔势贡献，并受到在位相互作用的增强，但受到最近邻相互作用的抑制。我们的结果丰富了一维莫尔系统中具有多次相变和自旋密度序的拓扑物理学，并且所提出模型的实现在不久的将来超冷原子装置中具有前景。
英文摘要：
Recent studies of 2D moiré materials have opened opportunities for advancing condensed matter physics. However, the effect of 1D moiré potentials on topological and correlated phases remains largely unexplored. Here we reveal a sequence of trivial-to-topological transitions and periodic-moiré-spin density waves induced by the 1D commensurate moiré potentials for spin-1/2 fermionic atoms. Such reentrant topology from a trivial phase is absent without the moiré potential and can be understood as the renormalization of topological parameters by the moiré strength. We then unveil the critical exponent and localization properties of the single-particle eigenstates. The periodic spin density wave of many-body ground states is contributed by the moiré potential, and is enhanced by on-site interactions but suppressed by nearest-neighbor interactions. Our results enrich the topological physics with multiple transitions and spin-density orders in 1D moiré systems, and the realization of the proposed model is promising in near-future ultracold atom setups.
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