Floating Wigner molecules and possible phase transitions in quantum dots |
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Authors: | SA Mikhailov K Ziegler |
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Institution: | (1) Theoretical Physics II, Institute for Physics, University of Augsburg, 86135 Augsburg, Germany, DE |
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Abstract: | 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.
Received 12 September 2001 / Received in final form 24 April 2002 Published online 9 July 2002 |
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Keywords: | PACS 73 20 Qt Electron solid – 73 21 La Quantum dots – 73 22 Gk Broken symmetry phases |
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