Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.27: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Deterministic creation of strain gradients in 2D materials — •Robert Schmidt, Johannes Kern, Jannis Bensmann, Paul Steeger, Robert Schneider, Helge Gehring, Wolfram H. P. Pernice, Steffen Michaelis de Vasconcellos, and Rudolf Bratschitsch — University of Münster, Institute of Physics and Center for Nanotechnology, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Strain is a powerful tool to modify the optical and electrical properties of 2D materials. While the controlled application of homogeneous strain to 2D materials is feasible, the creation of deterministic strain gradients over distances of several micrometers is still challenging. Commonly, monolayers or few-layers are manually transferred onto a pre-patterned substrate, which often results in strain gradients differing from sample to sample.

In this work, we imprint structures into 2D materials. Using a homebuilt nanoimprint setup and SiO₂ stamps produced by reactive ion etching, we print into 2D materials with lateral precision below one micrometer. The strain fields induced by this deformation are analyzed using optical absorption mapping.