Floating Wigner molecules and possible phase transitions in quantum dots

Mikhailov, S. A.; Ziegler, K.

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Floating Wigner molecules and possible phase transitions in quantum dots

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Mikhailov, S. A.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Ziegler, K.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Mikhailov, S. A., & Ziegler, K. (2002). Floating Wigner molecules and possible phase transitions in quantum dots. The European Physical Journal B, 28(1), 117-120.

Cite as: https://hdl.handle.net/21.11116/0000-000E-E9FF-D

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.