arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1005.1672cond-mat.mtrl-sci
收藏

石墨烯中量子反常霍尔效应的Rashba和交换效应

Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects

Zhenhua Qiao, Shengyuan A. Yang, Wanxiang Feng, Wang-Kong Tse, Jun Ding, Yugui Yao, Jian Wang, Qian Niu

摘要:

我们研究了在石墨烯中实现量子反常霍尔效应的可能性。我们发现,一个整体的能隙可以打开Rashba自旋轨道耦合和交换场的存在下。我们计算了Berry曲率分布,发现价带的Chern数不为零,证明了无带隙边态的存在。受这一发现的启发,我们还研究了,通过第一性原理方法,一个具体的例子,石墨烯与铁原子吸附在顶部,得到相同的结果。

英文摘要:

We investigate the possibility of realizing quantum anomalous Hall effect in graphene. We show that a bulk energy gap can be opened in the presence of both Rashba spin-orbit coupling and an exchange field. We calculate the Berry curvature distribution and find a non-zero Chern number for the valence bands and demonstrate the existence of gapless edge states. Inspired by this finding, we also study, by first principles method, a concrete example of graphene with Fe atoms adsorbed on top, obtaining the same result.

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。

↑