SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: 2D Materials I (joint session HL/CPP)

CPP 5.8: Talk

Monday, March 27, 2023, 11:30–11:45, POT 81

Theory of Thermalization of Excitons at Elevated Densities in Atomically Thin Semiconductors — •Manuel Katzer, Andreas Knorr, and Malte Selig — Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Atomically thin semiconductors exhibit tightly bound electron-hole pairs which stimulated exciton research in recent years [1]. So far, many studies focused on the understanding of exciton dynamics in the limit of very dilute systems. Recent experimental findings [2] raised the question of the excitonic thermalization behaviour for densities above this dilute, classical limit. Due to the co-bosonic nature of excitons [3], we find both bosonic but also fermionic contributions to the thermalization, with the fermionic Pauli blocking effects being dominant for a broad range of parameters. Based on a Heisenberg equation of motion ansatz [4], we discuss the first order of non-linear exciton-phonon interaction exceeding the classical Boltzmann scattering limit, in order to analyze the character of the exciton thermalization at elevated excitation densities.
[1] Wang et al. RMP 90, 021001 (2018). [2] Sigl et al. PRR 2 (4), 042044 (2020). [3] Katsch et al., PRL 124 25 257402 (2020). [4] Selig et al. PRR, 1, 022007 (2019).