Abstract
We study the quantum diffusive transport of multivalley massive Dirac cones, where time-reversal symmetry requires opposite spin orientations in inequivalent valleys. We show that the intervalley scattering and intravalley scattering can be distinguished from the quantum conductivity that corrects the semiclassical Drude conductivity, due to their distinct symmetries and localization trends. In immediate practice, it allows transport measurements to estimate the intervalley scattering rate in hole-doped monolayers of group-VI transition metal dichalcogenides (e.g., molybdenum dichalcogenides and tungsten dichalcogenides), an ideal class of materials for valleytronics applications. The results can be generalized to a large class of multivalley massive Dirac systems with spin-valley coupling and time-reversal symmetry.
Highlights
We study the quantum diffusive transport of multi-valley massive Dirac cones, where time-reversal symmetry requires opposite spin orientations in inequivalent valleys
We show that the intervalley scattering and intravalley scattering can be distinguished from the quantum conductivity that corrects the semiclassical Drude conductivity, due to their distinct symmetries and localization trends
Monolayer dichalcogenides are described by massive Dirac fermions, and intrinsic spin-orbit coupling (SOC) gives rise to splitting of valence bands with opposite spins, and the splitting must be opposite at the two valleys as required by time-reversal symmetry
Summary
We study the quantum diffusive transport of multi-valley massive Dirac cones, where time-reversal symmetry requires opposite spin orientations in inequivalent valleys. The results can be generalized to a large class of multi-valley massive Dirac systems with spin-valley coupling and time-reversal symmetry. Monolayer dichalcogenides are described by massive Dirac fermions, and intrinsic spin-orbit coupling (SOC) gives rise to splitting of valence bands with opposite spins, and the splitting must be opposite at the two valleys as required by time-reversal symmetry (see e.g. Fig. 1).
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