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Phys Rev Lett. 2013 Jul 12;111(2):026601. Epub 2013 Jul 9.

Transport theory of monolayer transition-metal dichalcogenides through symmetry.

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1
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA. yang.song@rochester.edu

Abstract

We present a theory that elucidates the major momentum and spin relaxation processes for electrons, holes, and hot excitons in monolayer transition-metal dichalcogenides. We expand on spin flips induced by flexural phonons and show that the spin relaxation is ultrafast for electrons in free-standing membranes while being mitigated in supported membranes. This behavior due to interaction with flexural phonons is universal in two-dimensional membranes that respect mirror symmetry, and it leads to a counterintuitive inverse relation between mobility and spin relaxation.

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