Direct Observation of Valley Coupled Topological Current in MoS${}_2$

Abstract

The valley degree of freedom of electrons in two-dimensional transition metal dichalcogenides has been extensively studied by theory, optical and optoelectronic experiments. However, generation and detection of pure valley current without relying on optical selection have not yet been demonstrated in these materials. Here, we report that valley current can be electrically induced and detected through the valley Hall effect and inverse valley Hall effect, respectively, in monolayer molybdenum disulfide. Specifically, long-range valley transport is observed over half a micron distance at room temperature. Our findings will enable a new generation of electronic devices utilizing the valley degree of freedom, which can be used for future novel valleytronic applications.

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Cited by in corpus (15)

• Valley-dependent spin transport in monolayer transition-metal dichalcogenides
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Domain wall induced spin-polarized flat bands in antiferromagnetic topological insulators
• Imaging the valley and orbital Hall effect in monolayer MoS2
• Valley contrasting bulk photovoltaic effect in antiferromagnetic MnPSe${}_3$ monolayer
• Valley polarized current and resonant electronic transport in a non-uniform ${\mathbf{MoS}}_2$ zigzag nanoribbon
• Gap states and valley-spin filtering in transition metal dichalcogenide monolayers
• Identifying Topological Superconductivity in 2D Transition-Metal Dichalcogenides
• Valley-Coupled-Spintronic Non-Volatile Memories with Compute-In-Memory Support
• Impact of novel electron-phonon coupling mechanisms on valley physics in two-dimensional materials
• Connecting physics to systems with modular spin-circuits
• Strain-Fluctuation-Induced Near-Quantization of Valley Hall Conductivity in Graphene Systems
• Spin Pumping into two-dimensional systems
• Pump-driven opto-magnetic properties in semiconducting transition-metal dichalcogenides: an analytical model
• Surface acoustic wave-driven valley current generation in intervalley coherent states