Spatial coherence of room-temperature monolayer WSe exciton-polaritons in a trap
arXiv:2103.10459 · doi:10.1038/s41467-021-26715-9
Abstract
The emergence of spatial and temporal coherence of light emitted from solid-state systems is a fundamental phenomenon, rooting in a plethora of microscopic processes. It is intrinsically aligned with the control of light-matter coupling, and canonical for laser oscillation. However, it also emerges in the superradiance of multiple, phase-locked emitters, and more recently, coherence and long-range order have been investigated in bosonic condensates of thermalized light, as well as in exciton-polaritons driven to a ground state via stimulated scattering. Here, we experimentally show that the interaction between photons in a Fabry-Perot microcavity and excitons in an atomically thin WSe layer is sufficient such that the system enters the hybridized regime of strong light-matter coupling at ambient conditions. Via Michelson interferometry, we capture clear evidence of increased spatial and temporal coherence of the emitted light from the spatially confined system ground-state. The coherence build-up is accompanied by a threshold-like behaviour of the emitted light intensity, which is a fingerprint of a polariton laser effect. Valley-physics is manifested in the presence of an external magnetic field, which allows us to manipulate K and K' polaritons via the Valley-Zeeman-effect. Our findings are of high application relevance, as they confirm the possibility to use atomically thin crystals as simple and versatile components of coherent light-sources, and in valleytronic applications at room temperature.
13 pages, 4 figures
References in corpus (11)
- Two-Dimensional Material Nanophotonics
- Strong light-matter coupling in two-dimensional atomic crystals
- Magnetic Control of Valley Pseudospin in Monolayer WSe2
- Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
- Bose-Einstein condensation of photons in an optical microcavity
- Moiré heterostructures as a condensed matter quantum simulator
- Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields
- Ultralow Threshold Polariton Condensate in a Monolayer Semiconductor Microcavity at Room Temperature
- Bosonic condensation of exciton-polaritons in an atomically thin crystal
- Motional narrowing, ballistic transport, and trapping of room-temperature exciton polaritons in an atomically-thin semiconductor
- Demonstration of a polariton step potential by local variation of light-matter coupling in a van-der-Waals heterostructure
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- Theoretical methods for excitonic physics in two-dimensional materials
- Brightening of a dark monolayer semiconductor via strong light-matter coupling in a cavity
- Moiré-induced optical non-linearities: Single and multi-photon resonances
- Enhancing ground state population and macroscopic coherence of room-temperature WS polaritons through engineered confinement
- Organic room-temperature polariton condensate in a higher-order topological lattice
- Circumventing the polariton bottleneck via dark excitons in 2D semiconductors
- Second-order temporal coherence of polariton lasers based on an atomically thin crystal in a microcavity
- Fabrication of high-quality PMMA/SiO spaced planar microcavities for strong coupling of light with monolayer WS excitons
- Revisiting the Siegert relation for the partially coherent regime of nanolasers
- Van der Waals waveguide quantum electrodynamics probed by infrared nano-photoluminescence
- Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes