Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers

Abstract

We develop a microscopic theory for nonlinear optical response of moiré exciton-polaritons in bilayers of transition metal dichalcogenides (TMDs). Our theory allows to study the tunnel-coupled intralayer and interlayer excitonic modes for a wide range of twist angles ($\theta$), external electric field, and light-matter coupling, providing insights into the hybridization regime inaccessible before. Specifically, we account for the Umklapp scattering processes of two exciton-polaritons responsible for enhanced nonlinearity, and show that it is crucial for describing interactions at strong hybridization. We reveal a regime of attractive nonlinearity for moiré polaritons, stemming from the anisotropic Coulomb interactions, which can explain some of experimental features of optical response in TMD bilayers. Furthermore, within our theory we demonstrate that the attractive nonlinearity can be tuned into repulsive by applying an external electric field. Our findings show that nonlinear moiré polaritons offer a controllable platform nonlinear polaritonic devices.

main text: 8 pages and 3 figures, supplemental material: 6 pages and 1 figure

References in corpus (25)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Van der Waals Heterostructure Polaritons with moiré-Induced Nonlinearity
• Strongly-Correlated Electron-Photon Systems
• Interlayer coupling in commensurate and incommensurate bilayer structures of transition metal dichalcogenides
• Exciton-exciton interaction in transition-metal dichalcogenide monolayers
• Electric-field switchable second-harmonic generation in bilayer MoS${}_2$ by inversion symmetry breaking
• Highly nonlinear dipolar exciton-polaritons in bilayer MoS${}_2$
• Tunable single photon emission from dipolaritons
• Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré ${\mathrm{WS}}_2$/${\mathrm{WSe}}_2$ heterobilayer
• Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
• Observation of Rydberg moiré excitons
• Nonlinear interactions of dipolar excitons and polaritons in MoS2 bilayers
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Few-photon all-optical phase rotation in a quantum-well micropillar cavity
• Twist-dependent intra- and interlayer excitons in moire MoSe2 homobilayers
• Moiré-induced optical non-linearities: Single and multi-photon resonances
• Exciton-exciton interactions in van der Waals heterobilayers
• Mott-moiré excitons
• Nonlinear Rydberg exciton-polaritons in Cu${}_2$O microcavities
• Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
• Electrically tunable dipolar interactions between layer-hybridized excitons
• Capacitively-coupled and inductively-coupled excitons in bilayer MoS${}_2$
• Non-bosonic moiré excitons
• Microscopic theory of nonlinear phase space filling in polaritonic lattices

Cited by in corpus (1)

• Polaritonic Machine Learning for Graph-based Data Analysis