Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.12: Poster
Mittwoch, 20. März 2024, 18:00–20:30, Poster E
Moiré Minibands, twist disorder and exciton-phonon coupling in van der Waals stacks — •Hendrik Lambers1, Nihit Saigal1, Nicolai-Leonic Bathen1, Veljko Antic1, Lennart Klebl2, Dante M. Kennes3, Tim O. Wehling2, and Ursula Wurstbauer1 — 1University of Münster, Münster, Germany — 2University of Hamburg, Hamburg, Germany — 3RWTH Aachen University, Aachen, Germany
The weak van der Waals coupling between layers of most two-dimensional (2D) materials allows the realization of precisely tailored 2D quantum systems. Twisted homobilayers such as tWSe2 are prone to the formation of moiré minibands. Guided by theoretical predication, we study tWSe2 homobilayer encapsulated in hBN by low-temperature resonant inelastic light scattering (RILS). We find resonant modes interpreted as single-particle collective inter-moiré-band excitations (IMBE) allowing to quantitatively probe the formation of a series of moiré-bands [1]. Moreover, we find that the resonance profiles particularly of the degenerated WSe2 A1’/E’ phonon modes are significantly impacted by the assembly in vdW stacks suggesting a higher order Raman scattering process presumably involving simultaneous excitation and annihilation of phonon modes with finite momentum. [1] N. Saigal et al., arXiv:2310.14417 (2023).
Keywords: van der Waals; moiré; miniband