II型外尔半金属中预测的异常磁阻

Predicted Unusual Magnetoresponse in Type-II Weyl Semimetals.

作者信息

Yu Zhi-Ming, Yao Yugui, Yang Shengyuan A

机构信息

Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China.

Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore.

出版信息

Phys Rev Lett. 2016 Aug 12;117(7):077202. doi: 10.1103/PhysRevLett.117.077202. Epub 2016 Aug 11.

DOI:10.1103/PhysRevLett.117.077202

PMID:27563994

Abstract

We show several distinct signatures in the magnetoresponse of type-II Weyl semimetals. The energy tilt tends to squeeze the Landau levels (LLs), and, for a type-II Weyl node, there always exists a critical angle between the B field and the tilt, at which the LL spectrum collapses, regardless of the field strength. Before the collapse, signatures also appear in the magneto-optical spectrum, including the invariable presence of intraband peaks, the absence of absorption tails, and the special anisotropic field dependence.

摘要

我们展示了II型外尔半金属磁响应中的几个不同特征。能量倾斜倾向于挤压朗道能级（LLs），并且对于II型外尔节点，在磁场与倾斜之间总是存在一个临界角，在该临界角处，无论场强如何，LL能谱都会崩塌。在崩塌之前，磁光光谱中也会出现特征，包括带内峰的始终存在、吸收尾的不存在以及特殊的各向异性场依赖性。