Evidence of topological insulator state in the semimetal LaBi

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

45 Scopus Citations
View graph of relations

Author(s)

  • R. Lou
  • B. B. Fu
  • Q. N. Xu
  • P. J. Guo
  • L. Y. Kong
  • L. K. Zeng
  • P. Richard
  • C. Fang
  • Y. B. Huang
  • S. S. Sun
  • Q. Wang
  • L. Wang
  • Y. G. Shi
  • H. C. Lei
  • K. Liu
  • H. M. Weng
  • T. Qian
  • H. Ding
  • S. C. Wang

Detail(s)

Original languageEnglish
Article number115140
Journal / PublicationPhysical Review B
Volume95
Issue number11
Publication statusPublished - 23 Mar 2017
Externally publishedYes

Abstract

By employing angle-resolved photoemission spectroscopy combined with first-principles calculations, we performed a systematic investigation on the electronic structure of LaBi, which exhibits extremely large magnetoresistance (XMR), and is theoretically predicted to possess band anticrossing with nontrivial topological properties. Here, the observations of the Fermi-surface topology and band dispersions are similar to previous studies on LaSb [L.-K. Zeng, R. Lou, D.-S. Wu, Q. N. Xu, P.-J. Guo, L.-Y. Kong, Y.-G. Zhong, J.-Z. Ma, B.-B. Fu, P. Richard, P. Wang, G. T. Liu, L. Lu, Y.-B. Huang, C. Fang, S.-S. Sun, Q. Wang, L. Wang, Y.-G. Shi, H. M. Weng, H.-C. Lei, K. Liu, S.-C. Wang, T. Qian, J.-L. Luo, and H. Ding, Phys. Rev. Lett. 117, 127204 (2016)PRLTAO0031-900710.1103/PhysRevLett.117.127204], a topologically trivial XMR semimetal, except the existence of a band inversion along the Γ-X direction, with one massless and one gapped Dirac-like surface state at the X and Γ points, respectively. The odd number of massless Dirac cones suggests that LaBi is analogous to the time-reversal Z2 nontrivial topological insulator. These findings open up a new series for exploring novel topological states and investigating their evolution from the perspective of topological phase transition within the family of rare-earth monopnictides.

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Evidence of topological insulator state in the semimetal LaBi. / Lou, R.; Fu, B. B.; Xu, Q. N.; Guo, P. J.; Kong, L. Y.; Zeng, L. K.; Ma, J. Z.; Richard, P.; Fang, C.; Huang, Y. B.; Sun, S. S.; Wang, Q.; Wang, L.; Shi, Y. G.; Lei, H. C.; Liu, K.; Weng, H. M.; Qian, T.; Ding, H.; Wang, S. C.

In: Physical Review B, Vol. 95, No. 11, 115140, 23.03.2017.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review