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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: 2D materials and their heterostructures (joint session DS/CPP/HL)
CPP 1.4: Vortrag
Montag, 27. September 2021, 12:00–12:15, H3
Tunnelling transport in bilayer graphene nanostructures with quantum dots — •Angelika Knothe1, Vladimir Fal'ko1, and Leonid Glazman2 — 1National Graphene Institute, University of Manchester, Manchester M13 9PL, United Kingdom — 2Department of Physics, Yale University, New Haven, CT 06520, USA
Quantum nanostructures, e.g., quantum wires and quantum dots, are needed for applications in quantum information processing devices, e.g., transistors or qubits. In gapped bilayer graphene (BLG), one can confine charge carriers electrostatically, inducing smooth confinement potentials while allowing gate-defined control of the confined structure. I will discuss charge transport in BLG nanostructures with electrostatically confined quantum dots. We investigate both theoretically and in collaboration with experiments how the BLG dots' highly degenerate single- and two-electron spin and valley multiplets, which depend on, e.g., the displacement field and the electron-electron interactions, manifest in tunnelling transport. This way, we shed light on BLG material parameters while opening the field for using the dots' rich spin and valley multiplets for quantum information.
1) Theory of tunneling spectra for a few-electron bilayer graphene quantum dot, A. Knothe, L. Glazman, V. Fal'ko, arXiv:2104.03399 2) Probing two-electron multiplets in bilayer graphene quantum dots, S. Möller, L. Banszerus, A. Knothe, L. Glazman, V. Fal'ko, C. Stampfer, et. al, arXiv:2106.08405 3) Quartet states in two-electron quantum dots in bilayer graphene, A. Knothe, V. Fal'ko, PRB 101, 235423 (2020)