ENTROPY ESTIMATES FOR FINITELY CORRELATED STATES
Autor(en): | FANNES, M NACHTERGAELE, B WERNER, RF |
Stichwörter: | DIMENSIONS; DYNAMICS; GROUND-STATES; Physics; Physics, Multidisciplinary; SPIN CHAINS; STRANGE ATTRACTORS | Erscheinungsdatum: | 1992 | Herausgeber: | GAUTHIER-VILLARS | Journal: | ANNALES DE L INSTITUT HENRI POINCARE-PHYSIQUE THEORIQUE | Volumen: | 57 | Ausgabe: | 3 | Startseite: | 259 | Seitenende: | 277 | Zusammenfassung: | We study in this paper the Renyi entropy densities of integer order for the class of finitely correlated states on a quantum spin chain, and obtain in this way explicit lower bounds for the usual entropy density. We apply this technique to obtain good bounds on the entropy density of a certain state on a spin-3/2 chain. This state is a ground state of a translation invariant nearest neighbour SU(2)-invariant interaction, which is thus shown to posses a residual entropy as T --> 0. Breaking the translation symmetry by adding a small SU(2)-invariant interaction of period two removes the ground state degeneracy, and produces a non-zero spectral gap above the ground state. |
ISSN: | 02460211 |
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