Zeeman-type spin splitting controlled by an electric field

Hongtao Yuan, Mohammad Saeed Bahramy, Kazuhiro Morimoto, Sanfeng Wu, Kentaro Nomura, Bohm-Jung Yang, Hidekazu Shimotani, Ryuji Suzuki, Minglin Toh, Christian Kloc, Xiaodong Xu, Ryotaro Arita, Naoto Nagaosa, Yoshihiro Iwasa

Research output: Contribution to journalArticlepeer-review

Abstract

Transition-metal dichalcogenides such as WSe2 and MoS2 have electronic band structures that are ideal for hosting many exotic spin–orbit phenomena. Here we investigate the possibility to generate and modulate a giant Zeeman-type spin polarization in WSe2 under an external electric field. By tuning the perpendicular electric field applied to the WSe2 channel with an electric-double-layer transistor, we observe a systematic crossover from weak localization to weak anti-localization in magnetotransport. Our optical reflection measurements also reveal an electrically tunable exciton splitting. Using first-principles calculations, we propose that these are probably due to the emergence of a merely out-of-plane and momentum-independent spin splitting at and in the vicinity of the vertices of the WSe2 Brillouin zone under electric field. The non-magnetic approach for creating such an intriguing spin splitting keeps the system time-reversally invariant, thereby suggesting a new method for manipulating the spin degrees of freedom of electrons.
Original languageEnglish
Pages (from-to)563-569
Number of pages7
JournalNature Physics
Volume9
DOIs
Publication statusPublished - 28 Jul 2013

Keywords

  • Electronic and spintronic devices
  • Electronic properties and materials
  • Two-dimensional materials

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