Ultralow Threshold Polariton Condensate in a Monolayer Semiconductor Microcavity at Room Temperature
arXiv:2010.04381 · doi:10.1021/acs.nanolett.1c01162
Abstract
Atomically thin transition metal dichalcogenides possess valley dependent functionalities that are usually available only at crogenic temperatures, constrained by various valley depolarization scatterings. The formation of exciton polaritons by coherently superimposing excitons and microcavity photons potentially harnesses the valley polarized polariton polariton interactions for novel valleytronics devices. Robust EPs have been demonstrated at room temperature in TMDs microcavity, however, the coherent polariton lasing and condensation remain elusive. Herein, we demonstrate for the first time the realization of EP condensation in a TMD microcavity at room temperature. The continuous wave pumped EP condensation and lasing with ultralow thresholdsis evidenced by the macroscopic occupation of the ground state, that undergoes a nonlinear increase of the emission and a continuous blueshift, a build up of spatial coherence, and a detuning-controlled threshold. Our work presents a critically important step towards exploiting nonlinear polariton polariton interactions and polaritonic devices with valley functionality at room temperature.
21 pages, 5 figures
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- Roadmap for Photonics with 2D Materials
- Advances in ultrafast plasmonics
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- Exact analytical solution for density matrix of a non-equilibrium polariton Bose-Einstein condensate
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- Bose-Einstein condensation of polaritons at room temperature in a GaAs/AlGaAs structure
- Second-order temporal coherence of polariton lasers based on an atomically thin crystal in a microcavity
- Self-Induced Valley Bosonic Stimulation of Exciton-Polaritons in a Monolayer Semiconductor
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- Fabrication of high-quality PMMA/SiO spaced planar microcavities for strong coupling of light with monolayer WS excitons
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- Quantum coherent states of mass-imbalanced electron-hole system within optical microcavities