Abstract
The ground state of a classical two-dimensional (2D) system with a
finite number of charge particles, trapped by two positive impurity
charges localized at a distance (z(0)) from the. 2D plane and separated
from each other by a distance chi(p) are obtained. The impurities are
allowed to carry more than one positive charge. This classical system
can form a 2D-like classical molecule that exhibits structural
transitions and spontaneous symmetry breaking as function of the
separation between the positive charges before it transforms into two
2D-like classical atoms. We also observe structural transitions as a
function of the dielectric constant of the substrate which supports the
charged particles, in addition to broken symmetry states and unbinding
of particles. (C) 2002 Elsevier Science Ltd. All rights reserved.
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