Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers

Research Article

A 2D Electron Gas for Studies on Tunneling Dynamics and Charge Storage in Self-assembled Quantum Dots

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  • @INPROCEEDINGS{10.1007/978-3-642-11731-2_22,
        author={Bastian Marquardt and Hicham Moujib and Axel Lorke and Dirk Reuter and Andreas Wieck and Martin Geller},
        title={A 2D Electron Gas for Studies on Tunneling Dynamics and Charge Storage in Self-assembled Quantum Dots},
        proceedings={Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers},
        proceedings_a={QUANTUMCOMM},
        year={2012},
        month={10},
        keywords={III-V semiconductors indium compounds self-assembly semiconductor quantum dots tunnelling two-dimensional electron gas},
        doi={10.1007/978-3-642-11731-2_22}
    }
    
  • Bastian Marquardt
    Hicham Moujib
    Axel Lorke
    Dirk Reuter
    Andreas Wieck
    Martin Geller
    Year: 2012
    A 2D Electron Gas for Studies on Tunneling Dynamics and Charge Storage in Self-assembled Quantum Dots
    QUANTUMCOMM
    Springer
    DOI: 10.1007/978-3-642-11731-2_22
Bastian Marquardt1,*, Hicham Moujib1, Axel Lorke1, Dirk Reuter2, Andreas Wieck2, Martin Geller1
  • 1: University of Duisburg-Essen
  • 2: Ruhr University Bochum
*Contact email: bastian.marquardt@uni-due.de

Abstract

The carrier tunneling dynamics of self-assembled InAs quantum dots (QD) is studied using time-resolved conductance measurements of a nearby two-dimensional electron gas (2DEG). The coupling strength (tunneling time) between the QDs and the 2DEG is adjusted by different thicknesses of the spacer layers. We demonstrate a strong influence of charged QDs on the conductance on the 2DEG, even for very weak coupling, where standard C-V spectroscopy is unsuitable to investigate the electronic structure of these QDs.