COMPLETE WETTING IN THE 3-DIMENSIONAL TRANSVERSE ISING-MODEL

We consider a three-dimensional Ising model in a transverse magnetic f ield h and a bulk field H. An interface is introduced by an appropriat e choice of boundary conditions. At the point (H=0, h=0) spin configur ations corresponding to different positions of the interface are degen erate. By studying the phase diagram near this multiphase point using quantum mechanical perturbation theory, we show that the quantum fluct uations, controlled by h, split the multiphase degeneracy giving rise to an infinite sequence of layering transitions.