Optical generation and detection of pure valley current in monolayer transition metal dichalcogenides

Abstract

We propose a practical scheme to generate a pure valley current in monolayer transition metal dichalcogenides by one-photon absorption of linearly polarized light. We show that the pure valley current can be detected by either photoluminescence measurements or the ultrafast pump-probe technique. Our method, together with the previously demonstrated generation of valley polarization, opens up the exciting possibility of ultrafast optical-only manipulation of the valley index. The tilted field effect on the valley current in experiment is also discussed.

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Cited by in corpus (7)

• PT-symmetry enabled spin circular photogalvanic effect in antiferromagnetic insulators
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• First-principles-based method for electron localization: Application to monolayer hexagonal boron nitride
• Switchable enhanced spin photocurrent in Rashba and cubic Dresselhaus ferroelectric semiconductors
• Optical induced Spin Current in Monolayer NbSe${}_2$
• Unidirectional valley-contrasting photo-current in strained transition metal dichalcogenide monolayers
• Scalable multicomponent spectral analysis for high-throughput data annotation