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Observation of topological surface states and strong electron/hole imbalance in extreme magnetoresistance compound LaBi

DOI: 10.1103/PhysRevMaterials.2.024201 DOI Help

Authors: J. Jiang (ShanghaiTech University; CAS-Shanghai Science Research Center; University of Oxford; Advanced Light Source; Pohang Accelerator Laboratory) , N. B. M. Schröter (University of Oxford) , S.-c. Wu (Max Planck Institute for Chemical Physics of Solids) , N. Kumar (Max Planck Institute for Chemical Physics of Solids) , C. Shekhar (Max Planck Institute for Chemical Physics of Solids) , H. Peng (University of Oxford) , X. Xu (Tsinghua University) , C. Chen (University of Oxford) , H. F. Yang (Chinese Academy of Sciences) , C.-c. Hwang (Pohang Accelerator Laboratory) , S.-k. Mo (Advanced Light Source) , C. Felser (Max Planck Institute for Chemical Physics of Solids) , B. H. Yan (Max Planck Institute for Chemical Physics of Solids) , Z. K. Liu (ShanghaiTech University; CAS-Shanghai Science Research Center) , L. X. Yang (Tsinghua University) , Y. L. Chen (ShanghaiTech University; CAS-Shanghai Science Research Center; University of Oxford; Tsinghua University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Materials , VOL 2

State: Published (Approved)
Published: February 2018
Diamond Proposal Number(s): 14132

Abstract: The recent discovery of the extreme magnetoresistance (XMR) in the nonmagnetic rare-earth monopnictides LaX (X = P, As, Sb, Bi,), a recently proposed new topological semimetal family, has inspired intensive research effort in the exploration of the correlation between the XMR and their electronic structures. In this work, using angle-resolved photoemission spectroscopy to investigate the three-dimensional band structure of LaBi, we unraveled its topologically nontrivial nature with the observation of multiple topological surface Dirac fermions, as supported by our ab initio calculations. Furthermore, we observed substantial imbalance between the volume of electron and hole pockets, which rules out the electron-hole compensation as the primary cause of the XMR in LaBi.

Journal Keywords: Electronic structure; Magnetotransport; Semimetals; Topological phases of matter; Topological materials; Photoemission spectroscopy

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: Advanced Light Source