Physics – Mathematical Physics
Scientific paper
1999-08-19
Comm. Math. Phys., 212 (2000) 63-91
Physics
Mathematical Physics
36 pages, 5 figures
Scientific paper
10.1007/s002200000192
We show that the ground states of the three-dimensional XXZ Heisenberg ferromagnet with a 111 interface have excitations localized in a subvolume of linear size R with energies bounded by O(1/R^2). As part of the proof we show the equivalence of ensembles for the 111 interface states in the following sense: In the thermodynamic limit the states with fixed magnetization yield the same expectation values for gauge invariant local observables as a suitable grand canonical state with fluctuating magnetization. Here, gauge invariant means commuting with the total third component of the spin, which is a conserved quantity of the Hamiltonian. As a corollary of equivalence of ensembles we also prove the convergence of the thermodynamic limit of sequences of canonical states (i.e., with fixed magnetization).
Bolina Oscar
Contucci Pierluigi
Nachtergaele Bruno
Starr Shannon
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