Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 40: 2D Semiconductors and van der Waals Heterostructures IV

HL 40.10: Vortrag

Mittwoch, 19. März 2025, 18:00–18:15, H15

Excitonic traps in freely suspended 2D membranes — •Alexander Musta^1,3, Leonard Geilen^1,3, Lukas Schleicher^2,3, Benedict Brouwer^1,3, Petricia Sara Peter^2,3, Anne Rodriguez^2,3, Eva Weig^2,3, and Alexander Holleitner^1,3 — ¹Walter Schottky Institute, TU Munich, Germany — ²Chair of Nano and Quantum Sensors, TU Munich, Germany — ³Munich Center for Quantum Science and Technology (MCQST), Munich, Germany

We present studies on the strain profile of large-area suspended transition-metal-dichalcogenides monolayers by photoluminescence measurements. Variations in the strain profile lead to band bending, which results in a redshift of the excitonic spectrum. Additionally, we observe an increase in intensity at the center of the suspended structures. We correlate the excitonic luminescence profiles with mechanical characterizations of the membranes, including AFM measurements and spatial mode mapping.

Keywords: TMDC; Optomechanics; Excitons; Suspended