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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 4
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Phys. Rev. Lett. 91, 046601 (2003) [4 pages]

Magnetically Induced Chessboard Pattern in the Conductance of a Kondo Quantum Dot

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M. Stopa1, W. G. van der Wiel2, S. De Franceschi3, S. Tarucha4, and L. P. Kouwenhoven3
1ERATO-JST, 3-1 Morinosato-Wakamiya, Atsugi-shi Kanagawa-ken, 243-0198, Japan
2PRESTO-JST, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of NanoScience and DIMES, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
3ERATO-JST, Department of NanoScience and DIMES, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
4ERATO-JST, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Received 26 February 2003; published 24 July 2003

We quantitatively describe the main features of the magnetically induced conductance modulation of a Kondo quantum dot—or chessboard pattern—in terms of a constant-interaction double quantum dot model. We show that the analogy with a double dot holds down to remarkably low magnetic fields. The analysis is extended by full 3D spin density functional calculations. Introducing an effective Kondo coupling parameter, the chessboard pattern is self-consistently computed as a function of magnetic field and electron number, which enables us to explain our experimental data quantitatively .

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.046601
DOI:
10.1103/PhysRevLett.91.046601
PACS:
72.15.Qm, 73.23.Hk
 
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