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  • Title: Single-Electron Double Quantum Dots in Bilayer Graphene.
    Author: Banszerus L, Möller S, Icking E, Watanabe K, Taniguchi T, Volk C, Stampfer C.
    Journal: Nano Lett; 2020 Mar 11; 20(3):2005-2011. PubMed ID: 32083885.
    Abstract:
    We present transport measurements through an electrostatically defined bilayer graphene double quantum dot in the single-electron regime. With the help of a back gate, two split gates, and two finger gates, we are able to control the number of charge carriers on two gate-defined quantum dots independently between zero and five. The high tunability of the device meets requirements to make such a device a suitable building block for spin-qubits. In the single-electron regime, we determine interdot tunnel rates on the order of 2 GHz. Both, the interdot tunnel coupling as well as the capacitive interdot coupling increase with dot occupation, leading to the transition to a single quantum dot. Finite bias magneto-spectroscopy measurements allow to resolve the excited-state spectra of the first electrons in the double quantum dot and are in agreement with spin and valley conserving interdot tunneling processes.
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