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Local symmetries and order-disorder transitions in small macroscopic Wigner islands

Gwennou Coupier1, Claudine Guthmann1, Yves Noat2, and Michel Saint Jean1,*

  • 1Laboratoire Matière et Systèmes Complexes, Université Paris 7, Unité mixte du C.N.R.S 7057, 140 rue de Lourmel, 75015 Paris, France
  • 2Institut des NanoSciences de Paris, Universités Paris 6/Paris 7, Unité mixte du C.N.R.S 7588, 140 rue de Lourmel, 75015 Paris, France

  • *Electronic address: saintjean@gps.jussieu.fr
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Phys. Rev. E 71, 046105 – Published 5 April, 2005

DOI: https://doi.org/10.1103/PhysRevE.71.046105

Abstract

The influence of local order on the disordering scenario of small Wigner islands is discussed. A first disordering step is put in evidence by the time correlation functions and is linked to individual excitations resulting in configuration transitions, which are very sensitive to the local symmetries. This is followed by two other transitions, corresponding to orthoradial and radial diffusion, for which both individual and collective excitations play a significant role. Finally, we show that, contrary to large systems, the focus that is commonly made on collective excitations for such small systems through the Lindemann criterion has to be made carefully in order to clearly identify the relative contributions in the whole disordering process.

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Phys. Rev. E 71, 046105– Published 5 April, 2005
  • Received 17 November 2004

© 2005 American Physical Society

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