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1. Reanalysis of experimental determinations of polariton-polariton interactions in microcavities

   https://doi.org/10.1103/PhysRevB.107.165302  

   Snoke, D. W.; Hartwell, V.; Beaumariage, J.; Mukherjee, S.; Yoon, Y.; Myers, D. M.; Steger, M.; Sun, Z.; Nelson, K. A.; Pfeiffer, L. N. (April 2023, Physical Review B)
2. 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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3. 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)
4. Metasurface Integrated Monolayer Exciton Polariton

   https://doi.org/10.1021/acs.nanolett.0c01624  

   Chen, Yueyang; Miao, Shengnan; Wang, Tianmeng; Zhong, Ding; Saxena, Abhi; Chow, Colin; Whitehead, James; Gerace, Dario; Xu, Xiaodong; Shi, Su-Fei; et al (July 2020, Nano Letters)

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5. Narrow-linewidth exciton-polariton laser

   https://doi.org/10.1364/OPTICA.525961  

   Fabricante, Bianca Rae; Król, Mateusz; Wurdack, Matthias; Pieczarka, Maciej; Steger, Mark; Snoke, David W; West, Kenneth; Pfeiffer, Loren N; Truscott, Andrew G; Ostrovskaya, Elena A; et al (January 2024, Optica)

   Exciton-polariton lasers are a promising source of coherent light for low-energy applications due to their low-threshold operation. However, a detailed experimental study of their spectral purity, which directly affects their coherence properties, is still missing. Here, we present a high-resolution spectroscopic investigation of the energy and linewidth of an exciton-polariton laser in the single-mode regime, which derives its coherent emission from an optically pumped and confined exciton-polariton condensate. We report an ultra-narrow linewidth of 56 MHz or 0.24 µeV, corresponding to a coherence time of 5.7 ns. The narrow linewidth is consistently achieved by using an exciton-polariton condensate with a high photonic content confined in an optically induced trap. Contrary to previous studies, we show that the excitonic reservoir created by the pump and responsible for creating the trap does not strongly affect the emission linewidth as long as the condensate is trapped and the pump power is well above the condensation (lasing) threshold. The long coherence time of the exciton-polariton system uncovered here opens up opportunities for manipulating its macroscopic quantum state, which is essential for applications in classical and quantum computing. 

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