Regensburg 2022 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: 2D Materials 7 (joint session DS/CPP)
DS 19.3: Talk
Wednesday, September 7, 2022, 15:30–15:45, H17
Coupled Bilayer Graphene Quantum Dots — •Angelika Knothe1,2 and Vladimir Fal'ko2,3 — 1Institute of Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2National Graphene Institute, University of Manchester, Manchester, UK — 3Henry Royce Institute for Advanced Materials, University of Manchester, Manchester, UK
Bilayer graphene quantum dots are promising for spin and valley qubits [1,2,3]. A functional quantum information architecture requires scalable multi-qubit systems. We theoretically study electrostatically confined double-dots and few-dot arrays in bilayer graphene. We quantify the inter-dot couplings for different dot parameters such as the field-induced gap, the confinement shape, and the inter-dot distance. This dependence on external parameters allows tuning the dot arrays into different regimes for which we study the extended Hubbard Hamiltonians and identify the spin and valley level structure. Our results will help to advance the use of bilayer graphene quantum dots for quantum technologies.
[1] A. Knothe, L. I. Glazman, V. Fal'ko, New Journal of Physics 24 (4), 043003 (2022)
[2] S. Möller, L. Banszerus, A. Knothe, C. Steiner, E. Icking, S. Trellenkamp, F. Lentz, K. Watanabe, T. Taniguchi, L. Glazman, V. Fal'ko, C. Volk, C. Stampfer, Phys. Rev. Lett. 127, 256802 (2021)
[3] A. Knothe, V. Fal'ko, Phys. Rev. B 101, 235423 (2020)