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Phys. Rev. B 74, 233301 (2006) [4 pages]

Kondo effect in a one-electron double quantum dot: Oscillations of the Kondo current in a weak magnetic field

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D. M. Schröer1,*, A. K. Hüttel1,†, K. Eberl2,‡, S. Ludwig1, M. N. Kiselev1,3,4,5, and B. L. Altshuler6,7
1Center for NanoScience and Department für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
2Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
3Institut für Theoretische Physik I, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
4Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
5The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34100 Trieste, Italy
6Physics Department, Columbia University, 538 West 120th Street, New York, New York 10027, USA
7NEC-Laboratories America, 4 Independence Way, Princeton, New Jersey 085540, USA

Received 21 August 2006; published 5 December 2006

We present transport measurements of the Kondo effect in a double quantum dot charged with only one or two electrons, respectively. For the one-electron case, we observe a surprising quasiperiodic oscillation of the Kondo conductance as a function of a small perpendicular magnetic field B∣≲50 mT. We discuss possible explanations of this effect and interpret it by means of a fine tuning of the energy mismatch of the single dot levels of the two quantum dots. The observed degree of control implies important consequences for applications in quantum information processing.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.233301
DOI:
10.1103/PhysRevB.74.233301
PACS:
73.21.La, 73.23.Hk, 72.15.Qm

*Electronic address: schroeer@lmu.de

Present address: Molecular Electronics and Devices, Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.

Present address: Lumics GmbH, Carl-Scheele-Strasse 16, 12489 Berlin, Germany.