Journal of East China Normal University(Natural Sc ›› 2018, Vol. 2018 ›› Issue (2): 101-108.doi: 10.3969/j.issn.1000-5641.2018.02.010

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Electrical manipulation of Rashba spin-orbit coupling in the two-dimensional transition metal dichalcogenide

YAO Qun-fang, CAI Jia, GONG Shi-jing   

  1. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China
  • Received:2017-02-21 Online:2018-03-25 Published:2018-03-22

Abstract: Using the first-principles density functional theory calculations, we investigate the Rashba spin-orbit coupling of the transition metal dichalcogenide (TMD) monolayers MX2(M=Mo, W; X=S, Se, Te) induced by the external electric field. It is found that the anions X play an important role on the Rashba spin-orbit coupling effect. With the increase of the atomic number of X, Rashba spin-orbit splitting around the Γ point increases more distinctively, and the external electric field can hardly influence the cations because of the coverage by the anions. Thus the strength of the Rashba spin-orbit coupling follows the sequence:WTe2 > MoTe2 > WSe2 > MoSe2 > WS2 > MoS2. Furthermore, the distribution of the spin polarization along the high symmetry line Γ-K/K' turns from the vertical direction to the two-dimensional plane under the external electric fields, and the in-plane spin polarization distribution rises with the increase of the external electric field.

Key words: two-dimentional transition metal dichalcogenide, Rashba spin-orbit coupling, first-principles calculation

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