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arXiv 1910.04730cond-mat.mes-hall
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相空间中作为拓扑不变量的霍尔电导率

Hall conductivity as topological invariant in phase space

I. V. Fialkovsky, M. Suleymanov, Xi Wu, C. X. Zhang, M. A. Zubkov

摘要:

众所周知,在恒定磁场存在下的量子霍尔电导率是通过拓扑TKNN不变量来表示的。相同的不变量是负责的固有的反常量子霍尔效应(AQHE),其中,此外,可以表示为一个在动量空间的两点格林函数组成。我们建议推广这个表达式的QHE中存在的非均匀磁场。该表达式是由两点格林函数的Weyl符号组成的相空间中的拓扑不变量。它适用于广泛的非均匀紧束缚模型,包括相互作用的。

英文摘要:

It is well known that the quantum Hall conductivity in the presence of constant magnetic field is expressed through the topological TKNN invariant. The same invariant is responsible for the intrinsic anomalous quantum Hall effect (AQHE), which, in addition, may be represented as one in momentum space composed of the two point Green's functions. We propose the generalization of this expression to the QHE in the presence of non-uniform magnetic field. The proposed expression is the topological invariant in phase space composed of the Weyl symbols of the two-point Green's function. It is applicable to a wide range of non-uniform tight-binding models, including the interacting ones.

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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