Review Article

Probing coherent electronic states in double quantum dots

  1. H. Qin1,
  2. A. W. Holleitner1,
  3. A. K. Hüttel1,
  4. R. H. Blick1,5,*,
  5. W. Wegscheider2,
  6. M. Bichler3,
  7. K. Eberl4,
  8. J. P. Kotthaus1

Article first published online: 21 JUN 2004

DOI: 10.1002/pssc.200404767

Issue

physica status solidi (c)

physica status solidi (c)

Special Issue: Semiconductor Nanometer Devices: Fundamentals – Concepts – Realisations

Volume 1, Issue 8, pages 2094–2110, July 2004

Additional Information

How to Cite

Qin, H., Holleitner, A. W., Hüttel, A. K., Blick, R. H., Wegscheider, W., Bichler, M., Eberl, K. and Kotthaus, J. P. (2004), Probing coherent electronic states in double quantum dots. physica status solidi (c), 1: 2094–2110. doi: 10.1002/pssc.200404767

Author Information

  1. 1

    Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany

  2. 2

    Institut für Angewandte und Experimentelle Physik, Universität Regensburg, 93040 Regensburg, Germany

  3. 3

    Walter-Schottky-Institut, Technische Universität München, 85747 Garching, Germany

  4. 4

    Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany

  5. 5

    Present address: Department of Electrical Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison WI 53706, USA

*Phone: +001 608 262 1952, Fax: +001 608 262 1952

Publication History

  1. Issue published online: 21 JUN 2004
  2. Article first published online: 21 JUN 2004
  3. Manuscript Accepted: 13 MAY 2005
  4. Manuscript Revised: 1 MAY 2004
  5. Manuscript Received: 15 MAR 2004

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Keywords:

  • 03.65.Ud;
  • 03.67.−a;
  • 73.21.La;
  • 73.23.Hk

Abstract

Experimental results on both serial and parallel double quantum dots are presented. The quantum dots are realized in the two-dimensional electron gas of an AlGaAs/GaAs heterostructure. By varying the inter-dot tunnel barriers, double quantum dots are tuned from the weak coupling limit to the strong coupling case. In serial double quantum dots, bonding and anti-bonding molecular states are probed by both direct tunneling and photon-assisted tunneling spectroscopy. In parallel double quantum dots, a coherent transport through the whole structure is verified through Aharonov-Bohm oscillations in the magnetotransport data. Furthermore, coherent molecular states are read out by a cotunneling current. Finally, a scheme for preparing and measuring a solid-state quantum bit is discussed. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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