Generation and Electric Control of Spin-Coupled Valley Current in WSe2
arXiv:1403.2696 · doi:10.1038/nnano.2014.183
Abstract
The valley degree of freedom in layered transition-metal dichalcogenides (MX2) provides the opportunity to extend functionalities of novel spintronics and valleytronics devices. Due to spin splitting induced by spin-orbital coupling (SOC), the non-equilibrium charge carrier imbalance between two degenerate and inequivalent valleys to realize valley/spin polarization has been successfully demonstrated theoretically and supported by optical experiments. However, the generation of a valley/spin current by the valley polarization in MX2 remains elusive and a great challenge. Here, within an electric-double-layer transistor based on WSe2, we demonstrated a spin-coupled valley photocurrent whose direction and magnitude depend on the degree of circular polarization of the incident radiation and can be further greatly modulated with an external electric field. Such room temperature generation and electric control of valley/spin photocurrent provides a new property of electrons in MX2 systems, thereby enabling new degrees of control for quantum-confined spintronics devices.
21 pages, 5 figures
References in corpus (6)
- Valley polarization in MoS2 monolayers by optical pumping
- Dissipationless Quantum Spin Current at Room Temperature
- Valley filter and valley valve in graphene
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Controlling electron-phonon interactions in graphene at ultra high carrier densities
- Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene
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