Observation of macroscopic valley-polarized monolayer exciton-polaritons at room temperature
MetadataShow full item record
In this letter, we address the chiral properties of valley exciton-polaritons in a monolayer of WS2 in the regime of strong light-matter coupling with a Tamm-Plasmon resonance. We observe that the valley polarization, which manifests in the circular polarization of the emitted photoluminescence, is strongly enhanced in comparison to bare WS2 monolayers, and can even be observed under non-resonant excitation at ambient conditions. We study the relaxation and decay dynamics of exciton-polaritons in our device, and present a microscopic model to explain the wave vector-dependent valley depolarization as an interplay of bright and dark states, electron-hole exchange interaction and the linear polarization splitting inherent to the microcavity.
Lundt , N , Stoll , S , Nagler , P , Nalitov , A , Klembt , S , Betzold , S , Goddard , J , Frieling , E , Kavokin , A V , Schüller , C , Korn , T , Höfling , S & Schneider , C 2017 , ' Observation of macroscopic valley-polarized monolayer exciton-polaritons at room temperature ' Physical Review. B, Condensed matter and materials physics .
Physical Review. B, Condensed matter and materials physics
© 2017, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version.
Funding: the State of Bavaria and the ERC (unlimit-2D), the DFG via SFB689, GRK 1570 and KO3612/1-1.
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.