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1. Probing exciton/exciton interactions with entangled photons: Theory

   https://doi.org/10.1063/1.5139197  

   Bittner, Eric R. ; Li, Hao ; Piryatinski, Andrei ; Srimath Kandada, Ajay Ram ; Silva, Carlos ( February 2020 , The Journal of Chemical Physics)
2. Polariton-enhanced exciton transport

   https://doi.org/10.1103/PhysRevB.98.235302  

   Myers, D. M. ; Mukherjee, S. ; Beaumariage, J. ; Snoke, D. W. ; Steger, M. ; Pfeiffer, L. N. ; West, K. ( December 2018 , Physical Review B)
3. Direct Evidence of Exciton–Exciton Annihilation in Single-Crystalline Organic Metal Halide Nanotube Assemblies

   https://doi.org/10.1021/acs.jpclett.8b00761  

   Ma, Ying-Zhong ; Lin, Haoran ; Du, Mao-Hua ; Doughty, Benjamin ; Ma, Biwu ( April 2018 , The Journal of Physical Chemistry Letters)
4. Fundamental limits of exciton-exciton annihilation for light emission in transition metal dichalcogenide monolayers

   https://doi.org/10.1103/PhysRevB.93.201111  

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5. Low Exciton Binding Energies and Localized Exciton–Polaron States in 2D Tin Halide Perovskites

   https://doi.org/10.1002/adom.202102698  

   Hansen, Kameron R. ; McClure, C. Emma ; Powell, Daniel ; Hsieh, Hao‐Chieh ; Flannery, Laura ; Garden, Kelsey ; Miller, Edwin J. ; King, Daniel J. ; Sainio, Sami ; Nordlund, Dennis ; et al ( March 2022 , Advanced Optical Materials)

   Aside from band gap reduction, little is understood about the effect of the tin‐for‐lead substitution on the fundamental optical and optoelectronic properties of metal halide perovskites (MHPs), especially when transitioning from 3D to lower dimensional structures. Herein, we take advantage of the spectroscopic isolation of excitons in 2D MHPs to study the intrinsic differences between lead and tin MHPs. The exciton's spectral fine structure indicates a larger polaron binding energy in tin MHPs. Additionally, the electroabsorption responses of the 2D MHPs demonstrates that tin MHPs have exciton binding energies 1.5–2× lower than that of their lead counterparts. Despite the lower binding energy, the excitons in tin MHPs are more Frenkel‐like with small radii, small polarizabilities, and large dipole moments. These results are interpreted as consequences of small polaron formation and disorder‐induced dipole moments. This work highlights the wide range of intrinsic differences between lead and tin MHPs as well as the complexity of excited states in these systems.

    

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