Spin transport in n-type single-layer transition-metal dichalcogenides

Article

关键词: MONOLAYER MOS2;    HIGH-MOBILITY;    VALLEY;    MAGNETIZATION;    COHERENCE;    INJECTION;    CHARGE;   

DOI  :  10.1103/PhysRevB.93.195301

来源: SCIE

【 摘 要 】

Valley asymmetry of the electron spectrum in transition-metal dichalcogenides (TMDs) originates from the spin-orbit coupling. Presence of spin-orbit fields of opposite signs for electrons in K and K' valleys in combination with possibility of intervalley scattering result in a nontrivial spin dynamics. This dynamics is reflected in the dependence of nonlocal resistance on external magnetic field (the Hanle curve). We calculate theoretically the Hanle shape in TMDs. It appears that, unlike conventionalmaterials without valley asymmetry, the Hanle shape in TMDs is different for normal and parallel orientations of the external field. For normal orientation, it has two peaks for slow intervalley scattering, while for fast intervalley scattering, the shape is usual. For parallel orientation, the Hanle curve exhibits a cusp at zero field. This cusp is a signature of a slow-decaying valley-asymmetric mode of the spin dynamics.

【 授权许可】

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