Room-temperature valley coherence in a polaritonic system (Conference Presentation)

Abstract

In the flourishing field of valleytronics, demand for coherently manipulating valley information at elevated temperature continues to escalate. Monolayer transition metal dichalcogenide, due to its strongly bonded excitons and degenerated valleys, nominates itself as a promising candidate for room temperature operation of valley degree of freedom (DOF). Through the hybridization of valley-resolved exciton and helicity-resolved photon mode, the valley DOF will be inherited by half-light, half-matter polaritons. Here, we demonstrate non-vanishing valley coherence of exciton-polaritons at room temperature in a cavity-embedded monolayer Tungsten Diselenide. The extra decay path through the exciton-cavity coupling, which is free of decoherence, is the key for intervalley phase correlation. These observations pave the way for room temperaturevalleytronic devices.