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Phys. Rev. B 74, 033306 (2006) [4 pages]

Intermediate low spin states in a few-electron quantum dot in the ν⩽1 regime

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Y. Nishi1, P. A. Maksym2, D. G. Austing3, T. Hatano4, L. P. Kouwenhoven5, H. Aoki1, and S. Tarucha4,6,*
1Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom
3Institute for Microstructural Sciences M23A, National Research Council, Montreal Road, Ottawa, Ontario, Canada K1A 0R6
4ICORP Spin Information Project, JST, Atsugi-shi, Kanagawa 243-0198, Japan
5Department of Applied Physics, Delft University of Technology, P.O.Box 5046, 2600 GA Delft, The Netherlands
6Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 17 April 2006; published 12 July 2006

We study the effects of electron-electron interactions in a circular few-electron vertical quantum dot in such a strong magnetic field that the filling factor ν⩽1. We measure excitation spectra and find ground state transitions beyond the maximum density droplet (ν=1) region. We compare the observed spectra with those calculated by exact diagonalization to identify the ground state quantum numbers, and find that intermediate low-spin states occur between adjacent spin-polarized magic number states.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.033306
DOI:
10.1103/PhysRevB.74.033306
PACS:
73.63.Kv, 73.23.Hk

*Electronic address: tarucha@ap.t.u-tokyo.ac.jp

 
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