In WSe2, phonon scattering moves excitons into momentum-dark states that do not couple valleys, quenching intervalley exchange coupling and extending valley lifetimes to nanoseconds, unlike in MoSe2 where lifetimes are hundreds of femtoseconds.
title Valley polarization in MoS2 monolayers by optical pumping
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Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
In WSe2, phonon scattering moves excitons into momentum-dark states that do not couple valleys, quenching intervalley exchange coupling and extending valley lifetimes to nanoseconds, unlike in MoSe2 where lifetimes are hundreds of femtoseconds.