Valley-selective optical Stark effect of exciton-polaritons in a monolayer semiconductor

Author:

LaMountain Trevor,Nelson Jovan,Lenferink Erik J.,Amsterdam Samuel H.,Murthy Akshay A.ORCID,Zeng Hongfei,Marks Tobin J.ORCID,Dravid Vinayak P.ORCID,Hersam Mark C.ORCID,Stern Nathaniel P.ORCID

Abstract

AbstractSelective breaking of degenerate energy levels is a well-known tool for coherent manipulation of spin states. Though most simply achieved with magnetic fields, polarization-sensitive optical methods provide high-speed alternatives. Exploiting the optical selection rules of transition metal dichalcogenide monolayers, the optical Stark effect allows for ultrafast manipulation of valley-coherent excitons. Compared to excitons in these materials, microcavity exciton-polaritons offer a promising alternative for valley manipulation, with longer lifetimes, enhanced valley coherence, and operation across wider temperature ranges. Here, we show valley-selective control of polariton energies in WS2 using the optical Stark effect, extending coherent valley manipulation to the hybrid light-matter regime. Ultrafast pump-probe measurements reveal polariton spectra with strong polarization contrast originating from valley-selective energy shifts. This demonstration of valley degeneracy breaking at picosecond timescales establishes a method for coherent control of valley phenomena in exciton-polaritons.

Funder

United States Department of Defense | United States Navy | Office of Naval Research

National Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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