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Title: Ultralow threshold polariton condensate in a monolayer semiconductor microcavity at room temperature
Authors: Zhao, Jiaxin
Su, Rui
Fieramosca, Antonio
Zhao, Weijie
Du, Wei
Liu, Xue
Diederichs, Carole
Sanvitto, Daniele
Liew, Timothy Chi Hin
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2021
Source: Zhao, J., Su, R., Fieramosca, A., Zhao, W., Du, W., Liu, X., Diederichs, C., Sanvitto, D., Liew, T. C. H. & Xiong, Q. (2021). Ultralow threshold polariton condensate in a monolayer semiconductor microcavity at room temperature. Nano Letters, 21(7), 3331-3339.
Journal: Nano Letters 
Abstract: Exciton-polaritons, hybrid light–matter bosonic quasiparticles, can condense into a single quantum state, i.e., forming a polariton Bose–Einstein condensate (BEC), which represents a crucial step for the development of nanophotonic technology. Recently, atomically thin transition-metal dichalcogenides (TMDs) emerged as promising candidates for novel polaritonic devices. Although the formation of robust valley-polaritons has been realized up to room temperature, the demonstration of polariton lasing remains elusive. Herein, we report for the first time the realization of this important milestone in a TMD microcavity at room temperature. Continuous wave pumped polariton lasing is evidenced by the macroscopic occupation of the ground state, which undergoes a nonlinear increase of the emission along with the emergence of temporal coherence, the presence of an exciton fraction-controlled threshold and the buildup of linear polarization. Our work presents a critically important step toward exploiting nonlinear polariton–polariton interactions, as well as offering a new platform for thresholdless lasing.
ISSN: 1530-6992
DOI: 10.1021/acs.nanolett.1c01162
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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