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- W3103084907 abstract "Two-dimensional semiconductors provide an ideal platform for exploration of linear exciton and polariton physics, primarily due to large exciton binding energy and strong light-matter coupling. These features, however, generically imply reduced exciton-exciton interactions, hindering the realization of active optical devices such as lasers or parametric oscillators. Here, we show that electrical injection of itinerant electrons into monolayer molybdenum diselenide allows us to overcome this limitation: dynamical screening of exciton-polaritons by electrons leads to the formation of new quasiparticles termed polaron-polaritons that exhibit unexpectedly strong interactions as well as optical amplification by Bose-enhanced polaron-electron scattering. To measure the nonlinear optical response, we carry out time-resolved pump-probe measurements and observe polaron-polariton interaction enhancement by a factor of 50 (0.5 μeV μm2) as compared to exciton-polaritons. Concurrently, we measure a spectrally integrated transmission gain of the probe field of ≳2 stemming from stimulated scattering of polaron-polaritons. We show theoretically that the nonequilibrium nature of optically excited quasiparticles favors a previously unexplored interaction mechanism stemming from a phase-space filling in the screening cloud, which provides an accurate explanation of the strong repulsive interactions observed experimentally. Our findings show that itinerant electron-exciton interactions provide an invaluable tool for electronic manipulation of optical properties, demonstrate a new mechanism for dramatically enhancing polariton-polariton interactions, and pave the way for realization of nonequilibrium polariton condensates.3 MoreReceived 21 October 2019Revised 19 January 2020Accepted 19 February 2020DOI:https://doi.org/10.1103/PhysRevX.10.021011Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasExcitonsPolaritonsPolaronsValleytronicsPhysical SystemsDoped semiconductorsPolariton condensateSemiconductorsTransition metal dichalcogenidesTechniquesFemtosecond laser spectroscopyPump-probe spectroscopyTime-resolved infrared spectroscopyCondensed Matter, Materials & Applied Physics" @default.
- W3103084907 created "2020-11-23" @default.
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- W3103084907 date "2020-04-15" @default.
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- W3103084907 title "Interacting Polaron-Polaritons" @default.
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- W3103084907 doi "https://doi.org/10.1103/physrevx.10.021011" @default.
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