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Electron transport through double quantum dots

W. G. van der Wiel*, S. De Franceschi, J. M. Elzerman, T. Fujisawa, S. Tarucha, and L. P. Kouwenhoven

W. G. van der Wiel*

  • Department of Physics and PRESTO, Japan Science and Technology Corporation (JST), Tokyo University, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Department of NanoScience and DIMES, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

S. De Franceschi and J. M. Elzerman

  • Department of NanoScience, DIMES, and ERATO Mesoscopic Correlation Project, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

T. Fujisawa

  • NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan

S. Tarucha

  • Department of Physics and ERATO Mesoscopic Correlation Project, Tokyo University, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

L. P. Kouwenhoven

  • Department of NanoScience, DIMES, and ERATO Mesoscopic Correlation Project, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • *Electronic address: wilfred@tomoko.phys.s.u-tokyo.ac.jp
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Rev. Mod. Phys. 75, 1 – Published 17 December, 2002

DOI: https://doi.org/10.1103/RevModPhys.75.1

Abstract

Electron transport experiments on two lateral quantum dots coupled in series are reviewed. An introduction to the charge stability diagram is given in terms of the electrochemical potentials of both dots. Resonant tunneling experiments show that the double dot geometry allows for an accurate determination of the intrinsic lifetime of discrete energy states in quantum dots. The evolution of discrete energy levels in magnetic field is studied. The resolution allows one to resolve avoided crossings in the spectrum of a quantum dot. With microwave spectroscopy it is possible to probe the transition from ionic bonding (for weak interdot tunnel coupling) to covalent bonding (for strong interdot tunnel coupling) in a double dot artificial molecule. This review is motivated by the relevance of double quantum dot studies for realizing solid state quantum bits.

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Rev. Mod. Phys. 75, 1– Published 17 December, 2002

    © 2002 American Physical Society

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