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

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [3];  [3];  [2];  [4];  [2];  [5];  [6];  [7];  [3];  [3];  [8];  [4];  [9]
  1. ShanghaiTech Univ. and CAS-Shanghai Science Research Center, Shanghai (China). School of Physical Science and Technology; Univ. of Oxford (United Kingdom). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Pohang Accelerator Lab.
  2. Univ. of Oxford (United Kingdom). Dept. of Physics
  3. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  4. Tsinghua Univ., Beijing (China). State Key Lab. of Low Dimensional Quantum Physics, Dept. of Physics
  5. Chinese Academy of Sciences (CAS), Shanghai (China). State Key Lab. of Functional Materials for Informatics, SIMIT
  6. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Pohang Accelerator Lab.
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. ShanghaiTech Univ. and CAS-Shanghai Science Research Center, Shanghai (China). School of Physical Science and Technology
  9. ShanghaiTech Univ. and CAS-Shanghai Science Research Center, Shanghai (China). School of Physical Science and Technology; Univ. of Oxford (United Kingdom). Dept. of Physics; Tsinghua Univ., Beijing (China). State Key Lab. of Low Dimensional Quantum Physics, Dept. of Physics
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The recent discovery of the extreme magnetoresistance (XMR) in the nonmagnetic rare-earth monopnictides La X (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. Here 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1571095
Journal Information:
Physical Review Materials, Vol. 2, Issue 2; ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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