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

Trevor LaMountain, Jovan Nelson, Erik J. Lenferink, Samuel H. Amsterdam, Akshay A. Murthy, Hongfei Zeng, Tobin J. Marks, Vinayak P. Dravid, Mark C. Hersam and Nathaniel P. Stern ()
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Trevor LaMountain: Northwestern University
Jovan Nelson: Northwestern University
Erik J. Lenferink: Northwestern University
Samuel H. Amsterdam: Northwestern University
Akshay A. Murthy: Northwestern University
Hongfei Zeng: Northwestern University
Tobin J. Marks: Northwestern University
Vinayak P. Dravid: Northwestern University
Mark C. Hersam: Northwestern University
Nathaniel P. Stern: Northwestern University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Selective 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.

Date: 2021
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DOI: 10.1038/s41467-021-24764-8

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