Regensburg 2022 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: 2D Materials 7 (joint session DS/CPP)
DS 19.4: Talk
Wednesday, September 7, 2022, 15:45–16:00, H17
Electron cavity optics in bilayer graphene — •Lukas Seemann1, Angelika Knothe1, Klaus Richter2, and Martina Hentschel1 — 1Institute of Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
Rapid developments in the field of 2D materials and their nanostructures make it possible to trap charge carriers with different dispersions in various confinement geometries with a high degree of control. This progress now allows studying 2D electron optics phenomena enriched by the charge carriers' different electronic and topological properties compared to the photonic case. Here, we theoretically investigate cavities in gapped bilayer graphene employing an approach based on ray-wave correspondence [1]. We identify the influence of the materials' trigonally warped band structure [2] on the fermion optics characteristics that we show to be conveniently tuneable by gate voltages. Similar considerations can be applied to electron optics in other 2D materials.
[1] J.-K. Schrepfer, S. Chen, M.-H. Liu, K. Richter, and M. Hentschel, Phys. Rev. B 104, 155436 (2021)
[2] C. Gold, A. Knothe, A. Kurzmann, A. Garcia-Ruiz, K. Watanabe, T. Taniguchi, V. Fal'ko, K. Ensslin, T. Ihn, Phys. Rev. Lett. 127, 046801 (2021)