Floating Wigner molecules and possible phase transitions in quantum dots

Details Floating Wigner molecules and possible phase transitions in quantum dots Floating Wigner molecules and possible phase transitions in quantum dots

2002-06-05

arxiv.org/abs/cond-mat/0206058v1

Eur. Phys. J. B 28, 117-120 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages incl 3 figures

Scientific paper

10.1140/epjb/e2002-00207-9

A floating Wigner crystal differs from the standard one by a spatial averaging over positions of the Wigner-crystal lattice. It has the same internal structure as the fixed crystal, but contrary to it, takes into account rotational and/or translational symmetry of the underlying jellium background. We study properties of a floating Wigner molecule in few-electron spin-polarized quantum dots, and show that the floating solid has the lower energy than the standard Wigner crystal with fixed lattice points. We also argue that internal rotational symmetry of individual dots can be broken in arrays of quantum dots, due to degenerate ground states and inter-dot Coulomb coupling.

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