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 journalArticle

286 Scopus citations

Abstract

Transition-metal dichalcogenides such as WSe 2 and MoS 2 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 WSe 2 under an external electric field. By tuning the perpendicular electric field applied to the WSe 2 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 WSe 2 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 (US)
Pages (from-to)563-569
Number of pages7
JournalNature Physics
Volume9
Issue number9
DOIs
StatePublished - Sep 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Yuan, H., Bahramy, M. S., Morimoto, K., Wu, S., Nomura, K., Yang, B. J., Shimotani, H., Suzuki, R., Toh, M., Kloc, C., Xu, X., Arita, R., Nagaosa, N., & Iwasa, Y. (2013). Zeeman-type spin splitting controlled by an electric field. Nature Physics, 9(9), 563-569. https://doi.org/10.1038/nphys2691