Intervalley Scattering and Localization Behaviors of Spin-Valley Coupled Dirac Fermions

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.110.016806· OSTI ID:1073686

Lu, Hai-Zhou ^[1]; Yao, Wang ^[1]; Xiao, Di ^[2]; Shen, Shun-Qing ^[1]

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1. University of Hong Kong, The
2. Carnegie Mellon University

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 holedoped 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 timereversal symmetry.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1073686
• Journal Information: Physical Review Letters, Vol. 110, Issue 1; ISSN 0031--9007
• Country of Publication: United States
• Language: English