Evidence for a strain-tuned topological phase transition in ZrTe5

Joshua Mutch, Wei Chih Chen, Preston Went, Tiema Qian, Ilham Zaky Wilson, Anton Andreev, Cheng Chien Chen, Jiun Haw Chu

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

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

Original languageEnglish
Article numbereaav9771
JournalScience Advances
Volume5
Issue number8
DOIs
Publication statusPublished - 9 Aug 2019
Externally publishedYes

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