Enhancing ground state population and macroscopic coherence of room-temperature WS${}_2$ polaritons through engineered confinement

Abstract

Exciton-polaritons (polaritons herein) in transition-metal dichalcogenide monolayers have attracted significant attention due to their potential for polariton-based optoelectronics. Many of the proposed applications rely on the ability to trap polaritons and to reach macroscopic occupation of their ground energy state. Here, we engineer a trap for room-temperature polaritons in an all-dielectric optical microcavity by locally increasing the interactions between the WS${}_2$ excitons and cavity photons. The resulting confinement enhances the population and the first-order coherence of the polaritons in the ground state, with the latter effect related to dramatic suppression of disorder-induced inhomogeneous dephasing. We also demonstrate efficient population transfer into the trap when optically injecting free polaritons outside of its periphery.

5 pages, 5 figures

References in corpus (10)

• Quantum fluids of light
• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• Exciton-polariton condensates
• Polariton laser using single micropillar GaAs-GaAlAs semiconductor cavities
• Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
• Engineering the spatial confinement of exciton-polaritons in semiconductors
• Creation of orbital angular momentum states with chiral polaritonic lenses
• Ultralong temporal coherence in optically trapped exciton-polariton condensates
• Phonon signatures in spectra of exciton polaritons in transition metal dichalcogenides
• Demonstration of a polariton step potential by local variation of light-matter coupling in a van-der-Waals heterostructure

Cited by in corpus (5)

• Roadmap for Photonics with 2D Materials
• Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor
• Exciton-phonon-scattering: A competition between bosonic and fermionic nature of bound electron-hole pairs
• Topological enhancement of exciton-polariton coherence with non-Hermitian morphing
• Multistable localized states in highly photonic polariton rings with a quasiperiodic modulation