Sub-meV Linewidth Nanocavity Trion-Polaritons in a Semiconductor Monolayer
ORAL
Abstract
Trion-polaritons in transition metal dichalcogenide (TMD) monolayers—hybrid quasiparticles formed by the strong coupling between trion resonances and optical cavity modes—offer a powerful platform for exploring many-body physics and realizing novel photonic devices such as polariton transistors and lasers. However, their linewidths are often limited by material quality, inhomogeneity, and cavity losses.
In this work, we demonstrate ultranarrow-linewidth trion-polaritons by strongly coupling a high-Q indium gallium phosphide (InGaP) nanobeam photonic crystal cavity mode to the trion resonance in a monolayer MoSe₂. The cavity is engineered to achieve a quality factor exceeding 5000 at the trion resonance. We observe a Rabi splitting of approximately 30 meV, and, notably, the lower polariton branch exhibits an exceptionally narrow linewidth of 0.8 meV—significantly smaller than previously reported values for TMD polaritons.
These results establish a new platform for investigating coherent and nonlinear quantum phenomena in two-dimensional polariton systems. We are currently exploring the system’s nonlinear optical response, with preliminary measurements indicating strong optical nonlinearities.
In this work, we demonstrate ultranarrow-linewidth trion-polaritons by strongly coupling a high-Q indium gallium phosphide (InGaP) nanobeam photonic crystal cavity mode to the trion resonance in a monolayer MoSe₂. The cavity is engineered to achieve a quality factor exceeding 5000 at the trion resonance. We observe a Rabi splitting of approximately 30 meV, and, notably, the lower polariton branch exhibits an exceptionally narrow linewidth of 0.8 meV—significantly smaller than previously reported values for TMD polaritons.
These results establish a new platform for investigating coherent and nonlinear quantum phenomena in two-dimensional polariton systems. We are currently exploring the system’s nonlinear optical response, with preliminary measurements indicating strong optical nonlinearities.
*This work was partly supported by the U.S. Office of Naval Research (ONR) through grants N00014-20-1-2325 on Robust Photonic Materials with High-Order Topological Protection and N00014-21-1-2703, as well as by the Sloan Foundation and DARPA.
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Presenters
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Zhi Wang
- University of Pennsylvania