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arXiv 1405.6599cond-mat.mes-hall
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圆锥上的朗道能级、自伴扩展和霍尔电导率

Landau levels, self-adjoint extensions and Hall conductivity on a cone

A. Poux, L. R. S. Araujo, C. Filgueiras, F. Moraes

摘要:

本文给出了圆锥面上二维电子气的朗道能级和零温霍尔电导率。我们从两种不同的方法研究了整数量子霍尔效应。第一种是一个外在的方法,它采用了一个有效的标量势,其中包含高斯和平均曲率的表面。第二种是内禀方法,其中高斯曲率是标量曲率势中的唯一项。从理论的观点来看,圆锥的奇异高斯曲率可能会影响波函数和相应的朗道能级。由于该问题需要{ \it自伴扩展},我们研究了圆锥尖对整数量子霍尔效应的影响,并与忽略波函数与圆锥尖耦合的情况进行了比较.这最后一种情况对应于所谓的{ \it Friedrichs扩展}。在所有情况下,霍尔电导率通过圆锥形几何形状增强,这取决于开口角。有相当数量的理论论文关注锥上的自伴扩张,现在我们希望这里所讨论的工作能激发实验研究这些问题的量子动力学锥。

英文摘要:

In this work we obtain the Landau levels and the Hall conductivity at zero temperature of a two-dimensional electron gas on a conical surface. We investigate the integer quantum Hall effect considering two different approaches. The first one is an extrinsic approach which employs an effective scalar potential that contains both the Gaussian and the mean curvature of the surface. The second one, an intrinsic approach where the Gaussian curvature is the sole term in the scalar curvature potential. From a theoretical point of view, the singular Gaussian curvature of the cone may affect the wave functions and the respective Landau levels. Since this problem requests {\it self-adjoint extensions}, we investigate how the conical tip could influence the integer quantum Hall effect, comparing with the case were the coupling between the wave functions and the conical tip is ignored. This last case corresponds to the so-called {\it Friedrichs extension}. In all cases, the Hall conductivity is enhanced by the conical geometry depending on the opening angle. There are a considerable number of theoretical papers concerned with the self-adjoint extensions on a cone and now we hope the work addressed here inspires experimental investigation on these questions about quantum dynamics on a cone.

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