Lasing of Moiré Trapped MoSe${}_2$/WSe${}_2$ Interlayer Excitons Coupled to a Nanocavity

Abstract

We report lasing of moiré trapped interlayer excitons (IXs) by integrating a pristine hBN-encapsulated MoSe${}_2$/WSe${}_2$ heterobilayer into a high-$Q$ ($>10^4$) nanophotonic cavity. We control the cavity-IX detuning using a magnetic field and measure their dipolar coupling strength to be $78\pm 4\mu \mathrm{eV}$, fully consistent with the 82 $\mu \mathrm{eV}$ predicted by theory. The emission from the cavity mode shows clear threshold-like behavior as the transition is tuned into resonance with the cavity. We observe a superlinear power dependence accompanied by a narrowing of the linewidth as the distinct features of lasing. The onset and prominence of these threshold-like behaviors are pronounced at resonance while weak off-resonance. Our results show that a lasing transition can be induced in interacting moiré IXs with macroscopic coherence extending over the length scale of the cavity mode. Such systems raise interesting perspectives for low-power switching and synaptic nanophotonic devices using two-dimensional materials.

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Cited by in corpus (8)

• A room-temperature moiré interlayer exciton laser
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Full Polarization Control of Photons with Evanescent Wave Coupling in the Ultra Subwavelength Gap of Photonic Molecules
• Atomically-Thin Transition Metal Dichalcogenide Nanolasers: Challenges and Opportunities
• Self-aligned hybrid nanocavities using atomically thin materials
• Electrically tunable MoSe${}_2$/WSe${}_2$ heterostructure-based quantum dot
• Light-matter interactions in layered materials and heterostructures: from moiré physics and magneto-optical effects to ultrafast dynamics and hybrid meta-photonics
• Review of the tight-binding method applicable to the properties of moiré superlattices