Journal
PHYSICAL REVIEW B
Volume 95, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.115140
Keywords
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Funding
- Ministry of Science and Technology of China [2012CB921701, 2013CB921700, 2015CB921000, 2016YFA0300300, 2016YFA0300504, 2016YFA0300600, 2016YFA0302400, 2016YFA0401000]
- National Natural Science Foundation of China [11274381, 11274362, 11474340, 11234014, 11274367, 11474330, 11574394, 11674371]
- Chinese Academy of Sciences (CAS) [XDB07000000]
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China (RUC) [17XNH055, 14XNLQ03, 15XNLF06, 15XNLQ07]
- CAS Pioneer Hundred Talents Program
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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)], a topologically trivial XMR semimetal, except the existence of a band inversion along the Gamma-X direction, with one massless and one gapped Dirac-like surface state at the X and Gamma points, respectively. The odd number of massless Dirac cones suggests that LaBi is analogous to the time-reversal Z(2) 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.
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