Spectral Flows Associated to Flux Tubes

Spectral Flows Associated to Flux Tubes
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与通量管相关的谱流

DOI:
10.1007/s00023-014-0394-5
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发表时间:
2016
期刊:
Annales Henri Poincaré
影响因子:
--
通讯作者:
H. Schulz-Baldes
H. Schulz-Baldes
中科院分区:
--
文献类型:
--
作者:
G. De Nittis;H. Schulz-Baldes

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当通量量子被推过带隙的二维紧束缚算符时,存在通过差距的相关谱流,其被示出为等于编码费米投影拓扑的Fredholm算符的指数。这是一个自然的数学公式劳克林的Gedanken实验。它用于提供体积-边缘对应的另一个证明。此外,当应用到系统的时间反演对称性,频谱流有一个characteristicsignature,而对于粒子-空穴对称系统,它导致了一个标准的存在零能量模式连接到半通量管。与其他结果相结合,这允许解释所有强不变量的二维拓扑绝缘体在一个单一的Fredholm运营商。
When a flux quantum is pushed through a gapped two- dimensional tight-binding operator, there is an associated spectral flow through the gap which is shown to be equal to the index of a Fredholm operator encoding the topology of the Fermi projection. This is a natural mathematical formulation of Laughlin’s Gedankenexperiment. It is used to provide yet another proof of the bulk-edge correspondence. Furthermore, when applied to systems with time reversal symmetry, the spectral flow has a characteristicsignature, while for particle–hole symmetric systems it leads to a criterion for the existence of zero energy modes attached to half-flux tubes. Combined with other results, this allows to explain all strong invariants of two-dimensional topological insulators in terms of a single Fredholm operator.
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影响因子: --
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