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arXiv 1002.1391hep-thcond-mat.mes-hallgr-qcquant-ph
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超环面紧化时空中的感生费米子流及其在圆柱和超环面纳米管中的应用

Induced fermionic current in toroidally compactified spacetimes with applications to cylindrical and toroidal nanotubes

S. Bellucci, A. A. Saharian, V. M. Bardeghyan

摘要:

本文计算了在常规范场作用下,任意数量的超环面紧化空间维的时空中,质量旋量场的费米子流真空期望值。利用Abel-Plana型求和公式和zeta函数技巧,给出了两种不同形式的费米子流。背景时空的非平凡拓扑结构导致了规范场诱导的费米子流的Aharonov-Bohm效应。电流是磁通量的周期函数,其周期等于磁通量量子。在没有规范场的情况下,对于非扭曲场和扭曲场的特殊情况,它消失了。应用的一般公式的Kaluz-Klein型模型和圆柱形和环形碳纳米管。在没有磁通量的情况下,碳纳米管中的总费米子电流消失,这是由于石墨烯六方晶格的两个不同子晶格的贡献被抵消。

英文摘要:

The vacuum expectation value of the fermionic current is evaluated for a massive spinor field in spacetimes with an arbitrary number of toroidally compactified spatial dimensions in presence of a constant gauge field. By using the Abel-Plana type summation formula and the zeta function technique we present the fermionic current in two different forms. Non-trivial topology of the background spacetime leads to the Aharonov-Bohm effect on the fermionic current induced by the gauge field. The current is a periodic function of the magnetic flux with the period equal to the flux quantum. In the absence of the gauge field it vanishes for special cases of untwisted and twisted fields. Applications of the general formulae to Kaluz-Klein type models and to cylindrical and toroidal carbon nanotubes are given. In the absence of magnetic flux the total fermionic current in carbon nanotubes vanishes, due to the cancellation of contributions from two different sublattices of the graphene hexagonal lattice.

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