Giant and tunable valley degeneracy splitting in MoTe2
By J. Qi, Xiao Li, Q. Niu, Ji Feng. 2015
237 citations recorded by the source corpus.
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 ${\mathrm{MoTe}}_{2}$ 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.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3837289e2cc73dd8c0b26355f1d705bb50345f73
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Citations in the corpus
- Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics (2017, background): “This is due to the different orbital character of the conduction and valence band edges (19, 20).”