In a Monte Carlo study of the two dimensional Ising system (of size 100 × 100) with nearest neighbour ferromagnetic interaction in the presence of a sinusoidally varying external magnetic field, we studied the variation of the hysteretic loop area (A) with frequency (f), amplitude (h0) of...

We investigate a model correlated bond percolation problem on a 2D square lattice. We throw conducting bonds at random on a lattice. The nearest-neighbour gaps (which are not actually connected through conducting bonds) are bridged by some other “tunneling” bonds, which represent tunneling...

We have studied the transport in two random dimer models. The site energies are chosen randomly from a binary distribution, one pair at a time and the hopping terms (nearest neighbour only) are chosen to be either (i) a constant, or (ii) perfectly correlated to adjacent random site energies. In...

We study localization properties of a one-dimensional disordered system characterized by a random non-hermitean hamiltonian where both the randomness and the non-hermiticity arises in the local site-potential; its real part being random, and a constant imaginary part implying the presence of...