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DS: Fachverband Dünne Schichten
DS 8: Transport Properties
DS 8.3: Vortrag
Dienstag, 10. März 2026, 14:30–14:45, REC/B214
Magnetotransport and Electron Optics in Bilayer Graphene — •Florian Schöppl1, Ming-Hao Liu2, Alina Mrenca- Kolasinska3, Klaus Richter1, Korbinian Rohrmüller1, Korbinian Schwarzmaier1, and Angelika Knothe1 — 1Institut für Theoretische Physik, Regensburg, Germany — 2Department of Physics, National Cheng Kung University, Tainan City, Taiwan — 3AGH University of Krakow, Kraków, Poland
The remarkable sample quality of bilayer graphene (BLG), combined with the strong electrostatic tunability of its band structure, makes BLG an excellent platform for electron optics. While the system's purity enables ballistic transport on micrometer scales [1,2], trigonal warping near each K point induces a valley-dependent momentum selection, resulting in characteristic anisotropic transport and scattering phenomena [3,4]. To study the interplay between such warping effects and symmetry breaking from gate-defined potentials, we employed quantum-mechanical tight-binding models as well as semiclassical simulations and find pronounced directional conductance in BLG cavities. Motivated by these anisotropic properties, we further analyze unguided -ringless- Aharonov-Bohm configurations and used wave-matching algorithms to tailor electrostatically defined lenses [5] and mirror geometries.
[1] L. Seemann et al., Phys. Rev. B (2023) [2] L. Banszerus et al., Nano Lett. 2016 [3] C. Gold et al., Phys. Rev. Lett. (2021) [4] J. K. Schrepfer et al., Phys. Rev. B (2021) [5] C. G. Péterfalvi et al., New J. Phys. 14 (2012)
Keywords: Bilayer Graphene; Aharonov Bohm; Electron Lensing; Magnetotransport; Veselago Lens