Giant and tunable valley degeneracy splitting in MoTe2

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jingshan Qi
  • Xiao Li
  • Qian Niu
  • Ji Feng

Detail(s)

Original languageEnglish
Article number121403
Journal / PublicationPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number12
Publication statusPublished - 8 Sep 2015
Externally publishedYes

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. ©2015 American Physical Society

Citation Format(s)

Giant and tunable valley degeneracy splitting in MoTe2. / Qi , Jingshan ; Li, Xiao ; Niu, Qian; Feng, Ji.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 12, 121403, 08.09.2015.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review