Datta Biswajit, Khatoniar Mandeep, Deshmukh Prathmesh, Thouin Félix, Bushati Rezlind, De Liberato Simone, Cohen Stephane Kena, Menon Vinod M
Department of Physics, City College of New York, New York, NY, USA.
Department of Physics, Graduate Center of the City University of New York (CUNY), New York, NY, USA.
Nat Commun. 2022 Oct 25;13(1):6341. doi: 10.1038/s41467-022-33940-3.
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 MoS 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 MoS 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.
在固态系统中实现低光子密度极限下的非线性光学响应一直是一个长期存在的挑战。在强耦合 regime 中承载激子极化激元的半导体微腔在这种情况下已成为有吸引力的候选者。然而，这些准粒子之间的弱相互作用一直是这一探索中的障碍。偶极激子提供了一种克服这一限制的有吸引力的策略，但它们的振子强度往往较弱。天然存在的同质双层 MoS 中的层间偶极激子由于其通过层间电荷转移激子与层内 B 激子的杂化形成而缓解了这一问题。在这里，我们展示了双层 MoS 中偶极激子极化激元的形成，导致了前所未有的非线性相互作用强度。与传统的 A 激子相比，层间偶极激子的非线性增加了十倍。这些高度非线性的偶极极化激元很可能在固态量子非线性器件的探索中成为领跑者。
