Giant and tunable valley degeneracy splitting in MoTe2
Giant and tunable valley degeneracy splitting in MoTe2
复制标题
MoTe2 中巨大且可调的谷简并分裂
DOI:
10.1103/physrevb.92.121403
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发表时间:
2015-04
期刊:
影响因子:
--
通讯作者:
Ji Feng
中科院分区:
文献类型:
--
作者:
Jingshan Qi;Xiao Li;Qian Niu;Ji Feng
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.
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