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math-ph2000
On the Ground State of Ferromagnetic Hamiltonians
J. Dittrich, V. I. Inozemtsev
It is generally believed that the ground state of the ferromagnetic Heisenberg-Dirac-Van Vleck Hamiltonians acting on s=1/2 spins of a lattice with N sites has the maximal possible…
math-ph2000
A model of interband radiative transitions
J. Dittrich, P. Exner, M. Hirokawa
We consider a simple model which is a caricature of a crystal interacting with a radiation field. The model has two bands of continuous spectrum and the particle can pass from the…