A pr 1 99 8 Plastic flow of persistent currents in two dimensional strongly interacting systems

A pr 1 99 6 Vortex dynamics in disordered Josephson junction arrays : from plastic flow to flux flow ∗

We study the dynamics of Josephson junction arrays with posi-tional disorder and driven by an external current. We consider weak magnetic fields, corresponding to a frustration f = n + 1/25 with n integer. We find that above the critical current i c there is a plastic flow of vortices, where most of the vortices are pinned and only a few vortices flow through channels. This dynamical regime is ...

2 9 A pr 1 99 8 Quantum Renormalization Group for 1 Dimensional Fermion Systems : a Modified Scheme

Inspired by the superblock method of White, we introduce a simple modification of the standard Renormalization Group (RG) technique for the study of quantum lattice systems. Our method which takes into account the effect of Boundary Conditions(BC), may be regarded as a simple way for obtaining first estimates of many properties of quantum lattice systems. By applying this method to the 1-dimens...

X iv : h ep - t h / 99 10 03 9 v 1 5 O ct 1 99 9 Schwinger terms of the commutator of two interacting currents in the 1 + 1 dimensions

We calculate the equal-time commutator of two fermionic currents within the framework of the 1+1 dimensional fully quantized theory, describing the interaction of massive fermions with a massive vector boson. It is shown that the interaction does not change the result obtained within the theory of free fermions.

Numerical Investigation of the Structure of Density Currents in a two Dimensional Channel

v 1 2 6 M ay 1 99 4 Suppression of persistent currents in 1 - D disordered rings by Coulomb interaction

Effects of Coulomb interaction on persistent currents in disordered one-dimensional rings are numerically investigated. First of all effectiveness of the Hartree-Fock approximation is established on small systems. Then the calculations are done for systems with 40 electrons in 100 sites. It is found that the amplitude of the average persistent current in the diffusive regime is suppressed as th...