Impurity effects in few-electron quantum dots: Incipient Wigner molecule regime

Details Impurity effects in few-electron quantum dots: Incipient Wigner molecule regime Impurity effects in few-electron quantum dots: Incipient Wigner molecule regime

2003-04-28

arxiv.org/abs/cond-mat/0304625v2

Europhysics Letters 64, 84-90 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 1 table, 4 figures, accepted for publication in Europhysics Letters

Scientific paper

10.1209/epl/i2003-00137-2

Numerically exact path-integral Monte Carlo data are presented for $N\leq 10$ 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 $\Delta(N)$, 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.

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