Rigorous results in quantum dynamics pages:250-253
Meeting on rigorous results in quantum dynamics location:Liblice date:10-15 June 1990
The time evolution of a spin in the spin-1/2 van der Waals model has been obtained by solving the Heisenberg equation of motion exactly. Using this solution, we have obtained the long time behavior of the autocorrelation function of a spin. The origin and mechanism of slow decay are described.