Spin injection and inverse Edelstein effect in the surface states of topological Kondo insulator SmB6

Song, Qi; Mi, Jian; Zhao, Dan; Su, Tang; Yuan, Wei; Xing, Wenyu; Chen, Yangyang; Wang, Tianyu; Wu, Tao; Chen, Xian Hui; Xie, X. C.; Zhang, Chi; Shi, Jing; Han, Wei

doi:10.1038/ncomms13485

Spin injection and inverse Edelstein effect in the surface states of topological Kondo insulator SmB₆

Journal Article · Thu Nov 10 23:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms13485· OSTI ID:1361407

Song, Qi ^[1]; Mi, Jian ^[2]; Zhao, Dan ^[3]; Su, Tang ^[2]; Yuan, Wei ^[2]; Xing, Wenyu ^[2]; Chen, Yangyang ^[2]; Wang, Tianyu ^[2]; Wu, Tao ^[4]; Chen, Xian Hui ^[5]; Xie, X. C. ^[2]; Zhang, Chi ^[2]; Shi, Jing ^[6]; ^[2]

Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Univ. of Science and Technology of China, Anhui (China); Chinese Academy of Sciences, Hefei (China)
Univ. of Science and Technology of China, Anhui (China); Chinese Academy of Sciences, Hefei (China); Nanjing Univ., Nanjing (China)
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)
Univ. of California, Riverside, CA (United States)

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, SmB₆. 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-07ER46351

OSTI ID:: 1361407

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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