Quantum melting of mesoscopic clusters
Abstract
By path integral Monte Carlo simulations we study the phase diagram of two  dimensional mesoscopic clusters formed by electrons in a semiconductor quantum dot or by indirect magnetoexcitons in double quantum dots. At zero (or sufficiently small) temperature, as quantum fluctuations of particles increase, two types of quantum disordering phenomena take place: first, at small values of quantum de Boer parameter q < 0.01 one can observe a transition from a completely ordered state to that in which different shells of the cluster, being internally ordered, are orientationally disordered relative to each other. At much greater strengths of quantum fluctuations, at q=0.1, the transition to a disordered (superfluid for the boson system) state takes place.
 Publication:

Physics of the Solid State
 Pub Date:
 October 1999
 DOI:
 10.1134/1.1131073
 arXiv:
 arXiv:condmat/9905194
 Bibcode:
 1999PhSS...41.1705B
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics;
 Condensed Matter  Statistical Mechanics
 EPrint:
 4 pages, 6 Postscript figures