Regensburg 2025 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 10: Transport Properties

DS 10.3: Vortrag

Donnerstag, 20. März 2025, 12:00–12:15, H14

Magneto transport in bilayer graphene cavities — •Florian Schöppl¹, Michael Barth¹, Ming-Hao Liu², Klaus Richter¹, and Angelika Knothe¹ — ¹Institut für Theoretische Physik, 93053 Regensburg, Germany — ²Department of Physics, National Cheng Kung University, Tainan City 701, Taiwan

The remarkable sample quality of bilayer graphene in combination with the unprecedented electronic control of the band-structure makes bilayer-graphene an excellent platform for electron optics. While the purity of the system allows for ballistic transport on the micrometer scales [1,2], the trigonal warping of the band structure close to each K points induces a valley dependent selection of momenta leading to unique transport and scattering properties [3,4]. Interested in the interplay of symmetry breaking induced by a variety of all-electronic gate confinements and the trigonal warping, we implement various quantum mechanical tight binding models as well as semiclassical simulations and deploy them to investigate magneto transport through bilayer graphene cavities.

[1]L. Seemann et al., Gate-tunable regular and chaotic electron dynamics in ballistic bilayer graphene cavities, Phys.Rev. B (2023) [2]L. Banszerus et al., Ballistic Transport Exceeding 28*m in CVD Grown Graphene, Nano Lett. 2016 [3]C. Gold et al., Coherent Jetting behind a gate-defined channel in bilayer graphene, Phys.Rev. Lett. (2021) [4]J.K. Schrepfer e t al. Dirac fermion optics and directed emession from single- and bilayer graphene cavities, Phys. Rev. B (2021)

Keywords: Magneto transport; Bilayer Graphene; Cavities