On the $$C^*$$C∗-Algebraic Approach to Topological Phases for Insulators

On the $$C^*$$C∗-Algebraic Approach to Topological Phases for Insulators
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关于绝缘体拓扑相的$$C^*$$C*-代数方法

DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
J. Kellendonk
J. Kellendonk
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作者:
J. Kellendonk

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绝缘子的拓扑相的概念是基于哈密顿量之间同伦的概念。因此,这取决于哈密顿学派所属的拓扑空间的选择。我们主张这个空间应该是可观测的$$C^*$$C∗-代数。我们将绝缘子的对称性与可观测代数上的分次实结构联系起来,并利用van Daele的K-理论公式对拓扑相进行了分类。这与Thiang最近在Karoubi公式中通过K-群分类拓扑相的方法是相关的,但不是完全相同的。
The notion of a topological phase of an insulator is based on the concept of homotopy between Hamiltonians. It therefore depends on the choice of a topological space to which the Hamiltonians belong. We advocate that this space should be the $$C^*$$C∗-algebra of observables. We relate the symmetries of insulators to graded real structures on the observable algebra and classify the topological phases using van Daele’s formulation of K-theory. This is related but not identical to Thiang’s recent approach to classify topological phases by K-groups in Karoubi’s formulation.
有隙自由费米子系统 $${mathbb{Z}_2}$$Z2 对称基态的 Bott 周期
DOI: 10.1007/s00220-015-2512-8
发表时间: 2016
影响因子: 2.4
作者:
R. Kennedy;M.R. Zirnbauer
通讯作者: M.R. Zirnbauer