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arXiv 2007.14150math-phcond-mat.mes-hallmath.MPquant-ph
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石墨烯中的部分谱流和Aharonov-Bohm效应

Partial spectral flow and the Aharonov-Bohm effect in graphene

Mikhail I. Katsnelson, Vladimir Nazaikinskii

摘要:

我们研究了由石墨烯片制成的开口管中的Aharonov-Bohm效应,石墨烯片的尺寸远大于石墨烯中的原子间距离。当外加磁场在石墨烯片及其附近消失时,磁场通过石墨管的磁通量被电磁开关打开,在此过程中,π电子紧束缚哈密顿量的能级不可避免地穿过费米能级,从而产生电子空穴对.对的数量被证明是等于外部场的磁通量量子的数量。证明是基于部分谱流的新概念,它推广了普通谱流已经在凝聚态物理中具有众所周知的应用(如超导体和超流体中的Kopnin力)。

英文摘要:

We study the Aharonov-Bohm effect in an openended tube made of a graphene sheet whose dimensions are much larger than the interatomic distance in graphene. An external magnetic field vanishes on and in the vicinity of the graphene sheet and its flux through the tube is adiabatically switched on. It is shown that, in the process, the energy levels of the tight-binding Hamiltonian of pi-electrons unavoidably cross the Fermi level, which results in the creation of electron-hole pairs. The number of pairs is proven to be equal to the number of magnetic flux quanta of the external field. The proof is based on the new notion of partial spectral flow, which generalizes the ordinary spectral flow already having well-known applications (such as the Kopnin forces in superconductors and superfluids) in condensed matter physics.

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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