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Title: Spin injection and inverse Edelstein effect in the surface states of topological Kondo insulator SmB 6

There has been considerable interest in exploiting the spin degrees of freedom of electrons for potential information storage and computing technologies. Topological insulators (TIs), a class of quantum materials, have special gapless edge/surface states, where the spin polarization of the Dirac fermions is locked to the momentum direction. This spin–momentum locking property gives rise to very interesting spin-dependent physical phenomena such as the Edelstein and inverse Edelstein effects. However, the spin injection in pure surface states of TI is very challenging because of the coexistence of the highly conducting bulk states. Here, we experimentally demonstrate the spin injection and observe the inverse Edelstein effect in the surface states of a topological Kondo insulator, SmB 6. At low temperatures when only surface carriers are present, a clear spin signal is observed. Moreover, the magnetic field angle dependence of the spin signal is consistent with spin–momentum locking property of surface states of SmB6.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ; ORCiD logo [1]
  1. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. Univ. of Science and Technology of China, Anhui (China); Chinese Academy of Sciences, Hefei (China)
  3. Univ. of Science and Technology of China, Anhui (China); Chinese Academy of Sciences, Hefei (China); Nanjing Univ., Nanjing (China)
  4. Univ. of Science and Technology of China, Anhui (China); Chinese Academy of Sciences, Hefei (China); Nanjing Univ., Nanjing (China); Chinese Academy of Sciences, Anhui (China)
  5. Univ. of California, Riverside, CA (United States)
Publication Date:
Grant/Contract Number:
FG02-07ER46351
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Univ. of California, Riverside, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; spintronics; topological insulators
OSTI Identifier:
1361407