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arXiv 2103.13393cond-mat.str-elcond-mat.mtrl-sci
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准晶的量子多体拓扑

Quantum many-body topology of quasicrystals

Dominic V. Else, Sheng-Jie Huang, Abhinav Prem, Andrey Gromov

摘要:

在本文中,我们描述了准晶相互作用的拓扑相的物质,即,被一些准晶结构保护的相。我们表明,准晶的弹性理论,它占“声子”和“相子”模式,承认非平凡的量子化拓扑项,远比他们的晶体同行丰富的结构。我们表明,这些术语对应于不同的物质相,也揭示了内在的准晶相,没有晶体类似物。对于具有内部$\mathrm{U}(1)$对称性的准晶,我们讨论了一些拓扑项的解释和物理含义,包括对$d=2$准晶中位错迁移率的限制和Lieb-Schultz-Mattis-Oshikawa-Hastings定理的准晶推广。然后,我们进一步扩展这些想法,并解决完整的分类准晶拓扑相位,包括系统的点群对称性以及不可逆的相位。因此,我们得到了“准晶等效原理”,它概括了分类的晶体拓扑相的准晶设置。

英文摘要:

In this paper, we characterize quasicrystalline interacting topological phases of matter i.e., phases protected by some quasicrystalline structure. We show that the elasticity theory of quasicrystals, which accounts for both "phonon" and "phason" modes, admits non-trivial quantized topological terms with far richer structure than their crystalline counterparts. We show that these terms correspond to distinct phases of matter and also uncover intrinsically quasicrystalline phases, which have no crystalline analogues. For quasicrystals with internal $\mathrm{U}(1)$ symmetry, we discuss a number of interpretations and physical implications of the topological terms, including constraints on the mobility of dislocations in $d=2$ quasicrystals and a quasicrystalline generalization of the Lieb-Schultz-Mattis-Oshikawa-Hastings theorem. We then extend these ideas much further and address the complete classification of quasicrystalline topological phases, including systems with point-group symmetry as well as non-invertible phases. We hence obtain the "Quasicrystalline Equivalence Principle," which generalizes the classification of crystalline topological phases to the quasicrystalline setting.

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