This article reviews, from a very personal point of view, the origins and the early work on
transitions driven by topological defects such as vortices in the two dimensional planar rotor …

We discuss the nature and sequence of phase transitions in two-dimensional systems with
continuous degeneracy, in which other factors must be taken into account in addition to the …

We study a one-dimensional Josephson-junction chain embedded in a magnetic field. We
show that, when the magnetic flux per elementary loop equals half the superconducting flux …

Two dimensional Josephson junction arrays (JJAs) offer theopportunity to study a variety of
basic physical concepts. Thepresent review focuses on recent experimental work on …

We present a detailed study of the critical properties of the two-dimensional (2D) XY model
with maximal frustration in a square lattice. We use extensive Monte Carlo simulations to …

We model a two-dimensional periodic array of Josephson junctions in a transverse magnetic
field by the uniformly frustrated XY model. We report the results of extensive nonequilibrium …

В 70-е годы было показано, что в широком классе двумерных систем с непрерывным
вырождением (включающем в себя, в частности, планарные ферромагнетики [1-5] …

We have fabricated and studied square two-dimensional arrays of Josephson oxide tunnel
junctions. Remarkable structure is observed in the longitudinal and transverse resistance as …

The unbinding of kink pairs on domain walls in the fully frustrated XY model (on square or
triangular lattices) is shown to induce the vanishing of phase coupling across the walls. This …

The fully frustrated XY model in two dimensions exhibits a vortex-unbinding as well as an
Ising transition. If the Ising transition overlaps with the critical line that ends on the vortex …