Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.45: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Back-action of charge detectors on graphene quantum dots — •Marvin Junk1, Christian Volk1,2, Christoph Neumann1,2, Stephan Engels1,2, and Christoph Stampfer1,2 — 1JARA-FIT and II. Institute of Physics B, RWTH Aachen, 52074 Aachen, Germany — 2Peter-Grünberg-Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
Graphene quantum devices, such as single electron transistors and quantum dots have received increasing attention over the last years. Quantum dots (QDs) made from graphene have been suggested to be an interesting system for implementing spin qubits. Compared to the well-established GaAs-based quantum dots their advantages are the smaller hyperfine interaction and reduced spin-orbit coupling, which promises more favorable spin coherence times.
Our devices consist of etched graphene QDs surrounded by electrostatic gates and two nearby graphene nanoribbons. Local resonances in these nanoribbons can be successfully used to detect individual charging events in the quantum dot even in regimes where the direct current through the QD is below the detection limit. The current through the QD and the charge detectors (CD) are measured simultaneously. In finite-bias spectroscopy measurements - so-called Coulomb diamonds - the CD is an important tool providing information on the asymmetry of the quantum dot device tunneling barriers. In the presented work we focus on the back-action of graphene CDs on the transport through the graphene quantum dot.