S. A. Blundell and S. Chackoy, SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France.

Dated: March 14, 2011

Abstract. An accurate conguation-interaction method employing a mean-eld basis set is used to study the excitation spectrum of localized Wigner states in the strongly interacting regime of a quasi-twodimensional parabolic quantum dot with N = 6 electrons. The approach achieves errors of order 1 part in 104 (or better) in the energies of low-lying states for a Wigner-Seitz radius rs = 12 a 0{16 a 0 , and is used to study low-lying spin, rotational, vibrational, and  isomeric excitations. The vibrational excitations at rs = 50 a 0 are shown to correspond qualitatively with the classical normal modes of the N = 6 electron dot, although the excitation energies agree only semiquantitatively with the classical normal-mode frequencies as a result of residual quantum uctuations.

In:Physical Review B, Volume 83, Issue 19
URL: http://link.aps.org/doi/10.1103/PhysRevB.83.195444