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1. Molecular polariton electroabsorption

   https://doi.org/10.1038/s41467-022-35589-4  

   Cheng, Chiao-Yu; Krainova, Nina; Brigeman, Alyssa N.; Khanna, Ajay; Shedge, Sapana; Isborn, Christine; Yuen-Zhou, Joel; Giebink, Noel C. (December 2022, Nature Communications)

   Abstract We investigate electroabsorption (EA) in organic semiconductor microcavities to understand whether strong light-matter coupling non-trivially alters their nonlinear optical [$${\chi }^{(3)}\left(\omega,{{{{\mathrm{0,0}}}}}\right)$$ ${\chi }^{\left(3\right)}\left(\omega ,\mathrm{0,\; 0}\right)$] response. Focusing on strongly-absorbing squaraine (SQ) molecules dispersed in a wide-gap host matrix, we find that classical transfer matrix modeling accurately captures the EA response of low concentration SQ microcavities with a vacuum Rabi splitting of$$\hslash \Omega \approx 200$$ $\hslash \Omega \approx 200$meV, but fails for high concentration cavities with$$\hslash \Omega \approx 420$$ $\hslash \Omega \approx 420$meV. Rather than new physics in the ultrastrong coupling regime, however, we attribute the discrepancy at high SQ concentration to a nearly dark H-aggregate state below the SQ exciton transition, which goes undetected in the optical constant dispersion on which the transfer matrix model is based, but nonetheless interacts with and enhances the EA response of the lower polariton mode. These results indicate that strong coupling can be used to manipulate EA (and presumably other optical nonlinearities) from organic microcavities by controlling the energy of polariton modes relative to other states in the system, but it does not alter the intrinsic optical nonlinearity of the organic semiconductor inside the cavity. 

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2. Polariton-polariton interaction beyond the Born approximation: A toy model study

   https://doi.org/10.1103/PhysRevA.102.063305  

   Hu, Hui; Deng, Hui; Liu, Xia-Ji (December 2020, Physical Review A)

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3. Exciton Polariton-Enhanced Photodimerization of Functionalized Tetracene

   https://doi.org/10.1021/acs.jpcc.1c06881  

   Puro, Richard; Van Schenck, Jonathan D.; Center, Reid; Holland, Emma K.; Anthony, John E.; Ostroverkhova, Oksana (December 2021, The Journal of Physical Chemistry C)
4. Ultrafast imaging of polariton propagation and interactions

   https://doi.org/10.1038/s41467-023-39550-x  

   Xu, Ding; Mandal, Arkajit; Baxter, James M.; Cheng, Shan-Wen; Lee, Inki; Su, Haowen; Liu, Song; Reichman, David R.; Delor, Milan (June 2023, Nature Communications)

   Abstract Semiconductor excitations can hybridize with cavity photons to form exciton-polaritons (EPs) with remarkable properties, including light-like energy flow combined with matter-like interactions. To fully harness these properties, EPs must retain ballistic, coherent transport despite matter-mediated interactions with lattice phonons. Here we develop a nonlinear momentum-resolved optical approach that directly images EPs in real space on femtosecond scales in a range of polaritonic architectures. We focus our analysis on EP propagation in layered halide perovskite microcavities. We reveal that EP–phonon interactions lead to a large renormalization of EP velocities at high excitonic fractions at room temperature. Despite these strong EP–phonon interactions, ballistic transport is maintained for up to half-exciton EPs, in agreement with quantum simulations of dynamic disorder shielding through light-matter hybridization. Above 50% excitonic character, rapid decoherence leads to diffusive transport. Our work provides a general framework to precisely balance EP coherence, velocity, and nonlinear interactions. 

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5. Topological valley Hall polariton condensation

   https://doi.org/10.1038/s41565-024-01674-6  

   Peng, Kai; Li, Wei; Sun, Meng; Rivero, Jose_D H; Ti, Chaoyang; Han, Xu; Ge, Li; Yang, Lan; Zhang, Xiang; Bao, Wei (May 2024, Nature Nanotechnology)