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Title: Zeeman-type spin splitting controlled by an electric field
Authors: Shimotani, Hidekazu
Yuan, Hongtao
Mohammad Saeed Bahramy
Morimoto, Kazuhiro
Wu, Sanfeng
Arita, Ryotaro
Nomura, Kentaro
Yang, Bohm-Jung
Suzuki, Ryuji
Toh, Minglin
Xu, Xiaodong
Nagaosa, Naoto
Iwasa, Yoshihiro
Kloc, Christian
Keywords: DRNTU::Engineering::Materials
Issue Date: 2013
Source: Yuan, H., Mohammad, S. B., Morimoto, K., Wu, S., Nomura, K., Yang, B. J., et al. (2013). Zeeman-type spin splitting controlled by an electric field. Nature physics, 9, 563-569.
Series/Report no.: Nature physics
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.
DOI: 10.1038/nphys2691
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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