Optical Hall conductivity in 2DEG and graphene QHE systems
Optical Hall conductivity in 2DEG and graphene QHE systems
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DOI：
10.1016/j.physe.2009.10.017
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发表时间：
2010-02-01
影响因子：
3.3
通讯作者：
Aoki, Hideo
中科院分区：
文献类型：
--
作者：
Morimoto, Takahiro;Hatsugai, Yasuhiro;Aoki, Hideo
我们已经从数值研究中发现，霍尔平台在普通二维电子气和量子霍尔机制中的石墨烯中的ac（类似于THz）机制中的光学霍尔电导率sigma（xy）（omega）中被保留，尽管ac中的平台高度偏离e2/h的整数倍。该效果仍然出乎意料地强大，对一个显着的强度的障碍，我们归因于本地化的效果。我们预测交流霍尔平台是可观察到的，通过法拉第旋转与旋转角的精细结构常数α的特点。本文通过数值计算阐明了平台结构与无序强度之间的关系。(C)2009爱思唯尔有限公司版权所有。
We have revealed from a numerical study that the Hall plateaus are retained in the optical Hall conductivity sigma(xy)(omega) in the ac (similar to THz) regime in both of the ordinary two-dimensional electron gas and graphene in the quantum Hall regime, although the plateau height in ac deviates from integer multiples of e2/h. The effect remains unexpectedly robust against a significant strength of disorder, which we attribute to an effect of localization. We predict the ac Hall plateaus are observable through the Faraday rotation with the rotation angle characterized by the fine-structure constant alpha. In this paper we clarify the relationship between plateau structures and the disorder strength by performing numerical calculation. (C) 2009 Elsevier B.V. All rights reserved.