Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Transport Properties

DS 14.3: Talk

Thursday, March 21, 2024, 10:00–10:15, A 060

Magneto transport in bilayer graphene cavities — •Florian Schöppl, Michael Barth, Klaus Richter, and Angelika Knothe — Institut für Theoretische Physik, 93053 Regensburg, Germany

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 and deploy them to investigate magneto transport through bilayer graphene cavities.

[1]L. Seemann A. Knothe M. Hentschel, Gate-tunable regular and chaotic electron dynamics in ballistic bilayer graphene cavities, Phys. Rev. B (2023) [2]L. Banszerus M. Schmitz S. Engels M.Goldsche K. Watanabe T. Taniguchi B. Beschoten Ch. Stampfer, Ballistic Transport Exceeding 28μm in CVD Grown Graphene, Nano Lett. 2016 [3]C. Gold A. Knothe A. Kurzmann A. Garcia-Ruiz K. Watanabe T. Taniguchi V. Fal*ko K. Ensslin T. Ihn, Coherent Jetting behind a gate-defined channel in bilayer graphene, Phys.Rev. Lett. (2021) [4]J.K. Schrepfer S.C. Chen M.H. Liu K. Richter M. Hentschel, Dirac fermion optics and directed emession from single- and bilayer graphene cavities, Phys. Rev. B (2021)

Keywords: Magneto Transport; Bilayer Graphene; Ballistic; Gate Defined Cavities