SKM 2023 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 43: Poster: Quantum Dynamics and Many-Body Systems
DY 43.11: Poster
Thursday, March 30, 2023, 13:00–16:00, P1
Electron cavity optics in bilayer graphene billiards — •Lukas Seemann1, Angelika Knothe2, Klaus Richter2, and Martina Hentschel1 — 1Technische 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. Here, we demonstrate the differences induced by deviating from an isotropic dispersion relation by theoretically investigating cavities in gapped bilayer graphene characterized by the presence of a trigonally warped band structure [1]. We employ an approach based on ray-wave correspondence [2] and find dramatic deviations from the optical-case behavior with clear signatures in phase space. We show that the fermion optics characteristics can be conveniently tuned by gate voltages and illustrate the experimentally relevant consequences.
[1] 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).
[2] J.-K. Schrepfer, S. Chen, M.-H. Liu, K. Richter, and M. Hentschel, Phys. Rev. B 104, 155436 (2021).