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

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

doi:10.1038/s41467-021-24764-8

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

Journal Article · Mon Jul 26 04:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-24764-8· OSTI ID:1816670

LaMountain, Trevor ^[1]; Nelson, Jovan ^[2]; Lenferink, Erik J. ^[3]; Amsterdam, Samuel H. ^[4]; ^[5]; Zeng, Hongfei ^[3]; ^[6]; ^[7]; ^[8]; ^[9]

Northwestern Univ., Evanston, IL (United States). Applied Physics Program; OSTI
Northwestern Univ., Evanston, IL (United States). Applied Physics Program
Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry and the Materials Research Center
Northwestern Univ., Evanston, IL (United States). The Materials Research Center. Dept. of Materials Science and Engineering, International Inst. of Nanotechnology
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry and the Materials Research Center, The Materials Research Center. Dept. of Materials Science and Engineering
Northwestern Univ., Evanston, IL (United States). The Materials Research Center. Dept. of Materials Science and Engineering, International Inst. of Nanotechnology, NUANCE Center
Northwestern Univ., Evanston, IL (United States). Applied Physics Program, Dept. of Chemistry and the Materials Research Center, The Materials Research Center. Dept. of Materials Science and Engineering, Dept. of Electrical and Computer Engineering
Northwestern Univ., Evanston, IL (United States). Applied Physics Program, Dept. of Physics and Astronomy

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.

View Accepted Manuscript (DOE)

Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012130

OSTI ID:: 1816670

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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