Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 40: 2D Semiconductors and van der Waals Heterostructures IV
HL 40.11: Talk
Wednesday, March 19, 2025, 18:15–18:30, H15
Rabi Splitting in Quantum Wells and TMDCs: Influence of Many-Particle Coulomb Correlations — •Henry Mittenzwey1, Felix Schäfer2, Markus Stein2, Oliver Voigt1, Lara Greten1, Daniel Anders2, Isabel Müller2, Florian Dobener2, Marzia Cuccu3, Christian Fuchs4, Kenji Watanabe5, Takashi Taniguchi5, Alexey Chernikov3, Kerstin Volz4, Sangam Chatterjee2, and Andreas Knorr1 — 1ITP, Technische Universität Berlin, D-10623 — 2LaMa, Justus-Liebig-University Giessen, D-35392 — 3IAPP and ct.qmat, Technische Universität Dresden, D-01062 — 4WZMW, Philipps-University Marburg, D-35032 — 5NIMS, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
In this joint theory-experiment collaboration, we study the Rabi splitting of excitons under simultaneous strong light-matter and Coulomb interaction on ultrafast timescales.
It turns out, that in a setting, where Coulomb and optical interaction are comparable (MQW), the Rabi splitting almost linearly follows the optical field amplitude similar to an ideal two-level system. On the other hand, in a setting with dominating Coulomb interaction (MoSe2), the Rabi splitting depends sublinearly on the optical field strength and it significantly deviates from an ideal two-level system. Within the developed theoretical approach based on Heisenberg equations of motion and a correlation expansion of many-body interactions, we identify the origin of this sublinear trend due to six-particle exciton-to-biexciton transitions.
Keywords: TMD; quantum well; Rabi splitting; many-body theory; exciton