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arXiv 1509.07532cond-mat.mes-hall
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Dirac纳米线中非拓扑表面态引起的Aharonov-Bohm振荡

Aharonov-Bohm oscillations caused by non-topological surface states in Dirac nanowires

V. V. Enaldiev, V. A. Volkov

摘要:

拓扑绝缘体表面态的一个有趣的指纹是纳米线的磁导性中的Aharonov-Bohm效应。我们发现,表面状态的狄拉克材料(铋,铋锑,铅锡硫属化物)的纳米线在非拓扑相,表现出相同的效果,作为修正体状态的磁导率。我们考虑了一个简单的模型的圆柱形纳米线,这是由三维狄拉克方程与一般的$T$不变的边界条件。边界条件是由一个单一的唯象参数,其符号定义拓扑和非拓扑表面状态。非拓扑表面态出现在能隙之外。在纵向磁场$B$中,它们导致了纳米线的态密度和相应的电导率的Aharonov-Bohm修正。这些磁振荡的相位随着$B$从$π$增加到$2π$。

英文摘要:

One intriguing fingerprint of surface states in topological insulators is the Aharonov-Bohm effect in magnetoconductivity of nanowires. We show that surface states in nanowires of Dirac materials (bismuth, bismuth antimony, and lead tin chalcogenides) being in non-topological phase, exhibit the same effect as amendment to magnetoconductivity of the bulk states. We consider a simple model of a cylindrical nanowire, which is described by the 3D Dirac equation with a general $T$-invariant boundary condition. The boundary condition is determined by a single phenomenological parameter whose sign defines topological-like and non-topological surface states. The non-topological surface states emerge outside the gap. In longitudinal magnetic field $B$ they lead to Aharonov-Bohm amendment for the density of states and correspondingly for conductivity of the nanowire. The phase of these magnetooscillations increases with $B$ from $π$ to $2π$.

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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