Valley asymmetry of the electron spectrum in transition metal dichalcogenides(TMDs) originates from the spin-orbit coupling. Presence of spin-orbit fieldsof opposite signs for electrons in K and K' valleys in combination withpossibility of intervalley scattering result in a nontrivial spin dynamics.This dynamics is reflected in the dependence of nonlocal resistance on externalmagnetic field (the Hanle curve). We calculate theoretically the Hanle shape inTMDs. It appears that, unlike conventional materials without valley asymmetry,the Hanle shape in TMDs is different for normal and parallel orientations ofthe external field. For normal orientation, it has two peaks for slowintervalley scattering, while, for fast intervalley scattering the shape isusual. 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 spindynamics.
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