Highly Confined In-plane Exciton-Polaritons in Monolayer Semiconductors

Abstract

2D materials support unique excitations of quasi-particles that consist of a material excitation and photons called polaritons. Especially interesting are in-plane propagating polaritons which can be confined to a single monolayer and carry large momentum. In this work, we report the existence of a new type of in-plane propagating polariton, supported on monolayer transition-metal-dicalcogonide (TMD) in the visible spectrum, which has not yet been observed. This 2D in-plane exciton-polariton (2DEP) is described by the coupling of an electromagnetic light field with the collective oscillations of the excitons supported by monolayer TMDs. We expose the specific experimental conditions required for the excitation of the 2DEP and show that these can be created if the TMD is encapsulated with hexagonal-boron-nitride (hBN) and cooled to cryogenic temperatures. In addition, we compare the properties of the 2DEPs with those of surface-plasmons-polaritons (SPPs) at the same spectral range, and find that the 2DEP exhibit over two orders-of-magnitude larger wavelength confinement. Finally, we propose two configurations for the possible experimental observation of 2DEPs.

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• In-plane Exciton Polaritons vs Plasmon Polaritons: Nonlocal corrections, confinement and loss
• Two limit cases of twisted hBN bilayers and their excitonic response
• Microscopic modelling of exciton-polariton diffusion coefficients in atomically thin semiconductors
• Polaritonic Quantum Matter
• 2D Semiconductors Superlattices as Hyperbolic Materials
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• The Importance of Pure Dephasing in the Optical Response of Excitons in High-quality van der Waals Heterostructures
• Exciton-polariton mediated interaction between two nitrogen-vacancy color centers in diamond using two-dimensional transition metal dichalcogenides
• Nanometer-scale Cavities for Mid-infrared Radiation via Image Phonon Polariton Resonators
• Guiding light with surface exciton-polaritons in atomically thin superlattices
• Temperature-dependent Optical and Polaritonic Properties of hBN-encapsulated Monolayer TMDs
• Microscopic theory of plasmon-enabled resonant terahertz detection in bilayer graphene
• Excitonic bound states in the continuum in van der Waals heterostructure metasurfaces
• Cryogenic Nano-Imaging of Excitons in a Monolayer Semiconductor
• The Transmission Line Model for 2D Materials and van der Waals Heterostructures