Highly nonlinear dipolar exciton-polaritons in bilayer MoS2

Biswajit Datta (), Mandeep Khatoniar, Prathmesh Deshmukh, Félix Thouin, Rezlind Bushati, Simone Liberato, Stephane Kena Cohen and Vinod M. Menon ()
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Biswajit Datta: City College of New York
Mandeep Khatoniar: City College of New York
Prathmesh Deshmukh: City College of New York
Félix Thouin: École Polytechnique de Montréal
Rezlind Bushati: City College of New York
Simone Liberato: School of Physics and Astronomy, University of Southampton
Stephane Kena Cohen: École Polytechnique de Montréal
Vinod M. Menon: City College of New York

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Realizing nonlinear optical response in the low photon density limit in solid-state systems has been a long-standing challenge. Semiconductor microcavities in the strong coupling regime hosting exciton-polaritons have emerged as attractive candidates in this context. However, the weak interaction between these quasiparticles has been a hurdle in this quest. Dipolar excitons provide an attractive strategy to overcome this limitation but are often hindered by their weak oscillator strength. The interlayer dipolar excitons in naturally occurring homobilayer MoS2 alleviates this issue owing to their formation via hybridization of interlayer charge transfer exciton with intralayer B exciton. Here we demonstrate the formation of dipolar exciton polaritons in bilayer MoS2 resulting in unprecedented nonlinear interaction strengths. A ten-fold increase in nonlinearity is observed for the interlayer dipolar excitons compared to the conventional A excitons. These highly nonlinear dipolar polaritons will likely be a frontrunner in the quest for solid-state quantum nonlinear devices.

Date: 2022
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DOI: 10.1038/s41467-022-33940-3

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