Dynamic behaviour of the ising model in a transverse field
Anna Kühnel, S. Wendt, Julia Mihailowa Wesselinowa
Abstract The Ising model in a transverse field is treated by means of Green function technique to calculate the dynamic structure factor above and below Tc. The soft mode is overdamped in the disordered phase and near Tc, while it is nearly undamped at low temperatures. The coupling between the transverse soft mode and the relaxing longitudinal mode produces a central mode in the dynamic structure factor. The temperature dependence of the dynamic structure factor for zero wave vector is calculated numerically.
physica status solidi (b)•Dec 1, 1977•23 citations