Issue |
Europhys. Lett.
Volume 64, Number 1, October 2003
|
|
---|---|---|
Page(s) | 84 - 90 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00137-2 | |
Published online | 01 November 2003 |
Impurity effects in few-electron quantum dots: Incipient Wigner molecule regime
Institut für Theoretische Physik,
Heinrich-Heine-Universität D-40225 Düsseldorf, Germany
Received:
29
April
2003
Accepted:
18
July
2003
Numerically exact path-integral Monte Carlo data are presented
for strongly interacting electrons confined in a 2D
parabolic quantum dot, including a defect to break rotational
symmetry. Low densities are studied, where an incipient Wigner
molecule forms. A single impurity is found to cause drastic
effects: 1) The standard shell-filling sequence with magic
numbers N=4, 6, 9, corresponding to peaks in the addition
energy
, is destroyed, with a new peak at N=8; 2)
spin gaps decrease; 3) for N=8, sub-Hund's rule spin S=0 is
induced; and 4) spatial ordering of the electrons becomes rather
sensitive to spin. We also comment on the recently observed
bunching phenomenon.
PACS: 71.10.-w – Theories and models of many-electron systems / 73.21.La – Electron states: Quantum dots / 73.63.Kv – Electronic transport: Quantum dots
© EDP Sciences, 2003
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