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Giant and tunable valley degeneracy splitting in MoTe2

Jingshan Qi (齐景山), Xiao Li (李晓), Qian Niu, and Ji Feng (冯济)
Phys. Rev. B 92, 121403(R) – Published 8 September 2015
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Abstract

Valleys in monolayer transition-metal dichalcogenides seamlessly connect two basic carriers of quantum information, namely, the electron spin and photon helicity. Lifting the valley degeneracy is an attractive route to achieve further optoelectronic manipulations. However, the magnetic field only creates a very small valley splitting. We propose a strategy to create giant valley splitting by the proximity-induced Zeeman effect. Our first principles calculations of monolayer MoTe2 on a EuO substrate show that valley splitting over 300 meV can be generated. Interband transition energies become valley dependent, leading to selective spin-photon coupling by optical frequency tuning. The valley splitting is also continuously tunable by rotating the substrate magnetization. The giant and tunable valley splitting adds a different dimension to the exploration of unique optoelectronic devices based on magneto-optical coupling and magnetoelectric coupling.

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  • Received 3 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.121403

©2015 American Physical Society

Authors & Affiliations

Jingshan Qi (齐景山)1, Xiao Li (李晓)2, Qian Niu2,3,4,*, and Ji Feng (冯济)3,4,†

  • 1School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, People's Republic of China
  • 2Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
  • 3International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
  • 4Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China

  • *niu@physics.utexas.edu
  • jfeng11@pku.edu.cn

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Issue

Vol. 92, Iss. 12 — 15 September 2015

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