arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.09616cond-mat.str-elcond-mat.dis-nncond-mat.mes-hall
收藏

量子霍尔谷

Quantum Hall Valley Nematics

S. A. Parameswaran, B. E. Feldman

摘要:

强磁场中的二维电子气为实现各种电子有序现象提供了一个正则平台。在这里,我们回顾了一类有趣的相互作用驱动的量子霍尔态的物理:量子霍尔谷向列相。当拓扑绝缘量子霍尔态的形成伴随着点群对称性的自发破缺时,物质的这些相就会出现,点群对称性结合了空间旋转和谷指数的排列。由此产生的取向顺序是特别敏感的淬火无序,而量子霍尔物理链接电荷传导拓扑缺陷。我们将讨论如何结合起来,产生丰富的相结构,以及它们对运输和光谱测量的影响。同时,我们讨论了相关的实验系统。最后,我们展望未来的发展方向。

英文摘要:

Two-dimensional electron gases in strong magnetic fields provide a canonical platform for realizing a variety of electronic ordering phenomena. Here we review the physics of one intriguing class of interaction-driven quantum Hall states: quantum Hall valley nematics. These phases of matter emerge when the formation of a topologically insulating quantum Hall state is accompanied by the spontaneous breaking of a point-group symmetry that combines a spatial rotation with a permutation of valley indices. The resulting orientational order is particularly sensitive to quenched disorder, while quantum Hall physics links charge conduction to topological defects. We discuss how these combine to yield a rich phase structure, and their implications for transport and spectroscopy measurements. In parallel, we discuss relevant experimental systems. We close with an outlook on future directions.

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。

↑