Evidence for a strain-tuned topological phase transition in ZrTe5

被引：116

作者：

Mutch, Joshua ^{[1
]}

Chen, Wei-Chih ^{[2
]}

Went, Preston ^{[1
]}

Qian, Tiema ^{[1
]}

Wilson, Ilham Zaky ^{[1
]}

Andreev, Anton ^{[1
]}

Chen, Cheng-Chien ^{[2
]}

Chu, Jiun-Haw ^{[1
]}

机构：

[1] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[2] Univ Alabama Birmingham, Dept Phys, Birmingham, AL 35294 USA

来源：

SCIENCE ADVANCES | 2019年 / 5卷 / 08期

关键词：

DIRAC FERMIONS; T-C; INVERSION; TRANSPORT;

D O I：

10.1126/sciadv.aav9771

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A phase transition between topologically distinct insulating phases involves closing and reopening the bandgap. Near the topological phase transition, the bulk energy spectrum is characterized by a massive Dirac dispersion, where the bandgap plays the role of mass. We report measurements of strain dependence of electrical transport properties of ZrTe5, which is known to host massive Dirac fermions in the bulk due to its proximity to a topological phase transition. We observe that the resistivity exhibits a pronounced minimum at a critical strain. We further find that the positive longitudinal magnetoconductance becomes maximal at the critical strain. This nonmonotonic strain dependence is consistent with the switching of sign of the Dirac mass and, hence, a strain-tuned topological phase transition in ZrTe5.

引用

页数：9