Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 64: Poster II
HL 64.46: Poster
Thursday, March 19, 2020, 10:00–13:00, P1A
Excited States in Bilayer Graphene Double Quantum Dots — •Alexander Rothstein1, Luca Banszerus1,2, Samuel Möller1, Eike Icking1,2, Kenji Watanabe3, Takashi Taniguchi3, Christian Volk1, and Christoph Stampfer1,2 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany, EU — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany, EU — 3National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
Due to its small spin orbit interaction and negligible hyperfine coupling as well as the possibility to open up a band gap, bilayer graphene (BLG) offers a promising platform for future spin-based quantum computation devices. Recent progress in the fabrication techniques and the possibility to fully pinch off current in BLG allow to electrostatically confine single- and double quantum dots by a smooth potential, which can be studied with regard to their electronic configuration.* Here, we present a remarkable degree of control of finger-gate based double quantum dots structure enabling to modify controllably the electron number in each of the quantum dots from zero up to a few electrons. We show an increasing inter dot tunnel coupling, as well as an increasing capacitive interdot coupling with a growing dot occupation. At a finite bias voltage, we can resolve the excited state spectrum of the first electrons in the double quantum dot and extract their energies as function of an applied out-of-plane magnetic field.