2023/09/06 by Kaiyue Peng, Peng, Kaiyue, Eran Rabani +1 · 1 citation
Materials Science · Physics and Astronomy · #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Dots Synthesis And Properties #Semiconductor Quantum Structures and Devices #Strong Light-Matter Interactions
paper · pdf · doi:10.48550/arxiv.2309.03399
openalex publication_date 2023/09/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Controlling the relaxation dynamics of excitons is key to improving the efficiencies of semiconductor--based applications. Confined semiconductor nanocrystals (NCs) offer additional handles to control the properties of excitons, for example, by changing their size or shape, resulting in a mismatch between excitonic gaps and phonon frequencies. This has led to the hypothesis of a significant slowing--down of exciton relaxation in strongly confined NCs, but in practice due to increasing exciton--phonon coupling and rapid multiphonon relaxation channels, the exciton relaxation depends only weakly on the size or shape. Here, we focus on elucidating the nonradiative relaxation of excitons in NCs placed in an optical cavity. We find that multiphonon emission of carrier governs the decay resulting in a polariton--induced phonon bottleneck with relaxation timescales that are slower by orders of magnitude compared to the cavity--free case, while the photon fraction plays a secondary role.