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TT: Fachverband Tiefe Temperaturen
TT 79: Quantum Chaos and Coherent Dynamics (joint session DY/TT)
TT 79.8: Talk
Thursday, March 21, 2024, 17:00–17:15, A 151
Tuning phase space and far-field emission in anisotropic bilayer-graphene cavities — •Lukas Seemann1, Angelika Knothe2, and Martina Hentschel1 — 1Technische Universität Chemnitz, 09107 Chemnitz, Germany — 2Universität Regensburg, 93040 Regensburg, Germany
Ray-wave correspondence is a well-known tool in optics. Its generalization to Fermi electron optics in 2D materials allows for the description of ballistic charge carrier transport, e.g. in gate-defined cavities [1]. Here we focus on bilayer graphene (BLG) with a trigonal warped Fermi line. Its anisotropic disperion relation with three preferred propagation directions implies an electron dynamics in BLG cavities that differs significantly from the optical case [2]. In this work we investigate the interplay of momentum and real space asymmetries by combining the anisotropic dispersion relation with a deformed cavity. We investigate the resulting charge carrier dynamics in o’nigiri shaped cavities where the latter provides the same C3 symmetry as the BLG Fermi line. We study its signatures in phase space and explain how it translates into the far-field. Its properties can be fine-tuned by choosing appropriate material parameters for the BLG system, by the cavity geometry, and the tilt angle between BLG lattice and cavity axis which opens a broad venue for applications.
[1] J.-K. Schrepfer, S. Chen, M.-H. Liu, K. Richter, and M. Hentschel, Phys. Rev. B 104, 155436 (2021)
[2] Lukas Seemann, Angelika Knothe, and Martina Hentschel Phys. Rev. B 107, 205404 (2023)
Keywords: ballistic charge carrier transport; bilayer graphene; gate-defined cavities