SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: 2D Materials II (joint session HL/CPP)
CPP 15.4: Vortrag
Montag, 27. März 2023, 15:45–16:00, POT 81
Coherence of interlayer exciton ensembles in MoSe2/WSe2 heterobilayers — •Christos Paspalides1, Mirco Troue1, Johannes Figueiredo1, Lukas Sigl1, Manuel Katzer2, Malte Selig2, Andreas Knorr2, Ursula Wurstbauer3, and Alexander Holleitner1 — 1TU Munich — 2Technische Universität Berlin — 3University of Münster
Transition metal dichalcogenides exhibit strong light-matter interactions, which suggests them to be ideal candidates for novel 2D optoelectronic applications. Corresponding van der Waals heterostacks allow the excitation and formation of long-lived interlayer excitons [1]. We present coherence measurements of the ground state in such interlayer exciton ensembles by performing Michelson-Morley interferometry over a wide range of exciton density and temperature [2]. Moreover, we discuss the expansion dynamics of the interlayer excitons presumably driven by dipole-dipole interactions. The presented work paves the way towards a detailed understanding of excitonic many-body quantum phenomena in two-dimensional materials [3].
[1] B. Miller et al., Nano Letters 17, 5229 (2017).
[2] M. Troue and J. Figueiredo, et al (2023).
[3] L. Sigl et al., Signatures of a degenerate many-body state of interlayer excitons in a van der Waals heterostack, Phys. Rev. Res. 2, 042044 (2020).