Jl. Lebowitz et Ae. Mazel, ON THE UNIQUENESS OF GIBBS-STATES IN THE PIROGOV-SINAI THEORY, Communications in Mathematical Physics, 189(2), 1997, pp. 311-321
We prove that, for low-temperature systems considered in the Pirogov-S
inai theory, uniqueness in the class of translation-periodic Gibbs sta
tes implies global uniqueness, i.e. the absence of any non-periodic Gi
bbs state. The approach to this infinite volume state is exponentially
fast.