Electrically tunable valley polarization and valley coherence in monolayer WSe 2 embedded in a van der Waals heterostructure [Invited]

摘要: The valley degree of freedom possessed by electronic excitations in transition metal dichalcogenides is providing new opportunities for information processing and optoelectronics. Valley contrasting polarization selection rules present unique optical control valleytronic devices. Critical to devices leveraging the ability tailor polarizability its coherence. In this manuscript, we demonstrate electric field both coherence a monolayer tungsten diselenide that has been incorporated into van der Waals heterostructure. We find competition between electron-hole exchange, radiative decay pure dephasing determines excitons trions.