Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 55: Graphene and 2D Materials (joint session TT/HL)

HL 55.7: Vortrag

Donnerstag, 20. März 2025, 16:30–16:45, H33

Effects of relaxation in deformed graphene structures — Jan Verlage¹, Thomas Stegmann², and •Nikodem Szpak¹ — ¹Fakultät für Physik, Universität Duisburg-Essen, Duisburg, Germany — ²Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Mexico

It is known that locally deformed graphene creates strong pseudomagnetic fields (of over 100 T) giving rise to Landau levels and being crucial elements of various valleytronic devices. However, taking into account the atomic relaxation of such structures may lead to reduction and regularization of the strain. Here, we revise these effects in various previously studied setups, including membranes and bumps. Our numerical simulations indicate that the atomic relaxation induces a reduction of the pseudomagnetic field by a factor of 5 ÷ 10. It may have several consequences for applications.

Keywords: Graphene; Elastic deformations; Relaxation