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

Author

Listed:
  • Trevor LaMountain

    (Northwestern University)

  • Jovan Nelson

    (Northwestern University)

  • Erik J. Lenferink

    (Northwestern University)

  • Samuel H. Amsterdam

    (Northwestern University)

  • Akshay A. Murthy

    (Northwestern University
    Northwestern University)

  • Hongfei Zeng

    (Northwestern University)

  • Tobin J. Marks

    (Northwestern University
    Northwestern University)

  • Vinayak P. Dravid

    (Northwestern University
    Northwestern University
    Northwestern University)

  • Mark C. Hersam

    (Northwestern University
    Northwestern University
    Northwestern University
    Northwestern University)

  • Nathaniel P. Stern

    (Northwestern University
    Northwestern University)

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.

Suggested Citation

  • Trevor LaMountain & Jovan Nelson & Erik J. Lenferink & Samuel H. Amsterdam & Akshay A. Murthy & Hongfei Zeng & Tobin J. Marks & Vinayak P. Dravid & Mark C. Hersam & Nathaniel P. Stern, 2021. "Valley-selective optical Stark effect of exciton-polaritons in a monolayer semiconductor," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24764-8
    DOI: 10.1038/s41467-021-24764-8
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    Cited by:

    1. Jiaxin Zhao & Antonio Fieramosca & Ruiqi Bao & Kevin Dini & Rui Su & Daniele Sanvitto & Qihua Xiong & Timothy C. H. Liew, 2024. "Room temperature polariton spin switches based on Van der Waals superlattices," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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