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arXiv 0901.2686cond-mat.mes-hallcond-mat.supr-conhep-thmath-phmath.MP
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拓扑绝缘体和超导体周期表

Periodic table for topological insulators and superconductors

Alexei Kitaev

摘要:

非相互作用的费米子,有和没有电荷守恒和时间反演对称性的带隙相位,分类使用波特周期。对称性和空间维数决定了一个一般普适类,它对应于2类复形和8类实Clifford代数之一。给定类中的相进一步由拓扑不变量来表征,拓扑不变量是某个阿贝尔群的元素,可以是0、Z或Z_2。具有不同拓扑数的两个无限相之间的界面必须携带某种无隙模。有限系统的拓扑性质用K-同调来描述。这种分类是强大的相对于无序,提供费米能附近的电子状态是不存在或本地化。在某些情况下(例如,整数量子Hall系统)的K理论分类对相互作用是稳定的,但也给出了一个反例。

英文摘要:

Gapped phases of noninteracting fermions, with and without charge conservation and time-reversal symmetry, are classified using Bott periodicity. The symmetry and spatial dimension determines a general universality class, which corresponds to one of the 2 types of complex and 8 types of real Clifford algebras. The phases within a given class are further characterized by a topological invariant, an element of some Abelian group that can be 0, Z, or Z_2. The interface between two infinite phases with different topological numbers must carry some gapless mode. Topological properties of finite systems are described in terms of K-homology. This classification is robust with respect to disorder, provided electron states near the Fermi energy are absent or localized. In some cases (e.g., integer quantum Hall systems) the K-theoretic classification is stable to interactions, but a counterexample is also given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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