Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: 2D Materials I – Excitonic properties
HL 3.7: Talk
Monday, March 9, 2026, 11:15–11:30, POT/0081
Transport of exciton complexes in the presence of Fermi sea of free carriers in monolayer semiconductors — •Minushree Rout1, Koloman Wagner1,2, Jonas Ziegler1,2, Raul Perea-Causin3, Samuel Brem4, Ermin Malic4, and Alexey Chernikov1 — 1Institute of Applied Physics, Technische Universität Dresden, Germany — 2Department of Physics, University of Regensburg, Germany — 3Department of Physics, Stockholm University, Sweden — 4Department of Physics, Philipps-Universität Marburg, Germany
Exciton-carrier interactions in doped monolayer semiconductors present an interesting and technologically relevant scenario in solid-state physics. Among the consequences is the formation of trions-three particle system formed when excitons bind with free charge carriers. Here, we aim to explore how trion-phonon and exciton-carrier interactions influence excitonic quasiparticle diffusion using transient microscopy. Theoretical results predict that trions have reduced mobility at low carrier densities due to strong phonon coupling and increased mass. At higher densities, effective trion diffusion should increase significantly due to the Fermi pressure effect. Previous experimental studies revealed that exciton diffusion shows a non-monotonic dependence on carrier density, transitioning from elastic scattering regime to the formation of bound quasiparticle states like trions and fermi-polarons. This work aims to uncover the fundamental mechanisms governing the transport of light-emitting quasiparticles in the presence Fermi-bose mixtures in 2D semiconductors and experimentally test the prediction of the Fermi-pressure effect.
Keywords: 2D semiconductors; exciton; diffusion; trions; fermi-polaron