Critical and Massive Phases in Spin Chains and Spin Ladders
J. Sólyom
Research Institute for Solid State Physics, Hungarian Academy of Sciences, P.O. Box 49, 1525 Budapest, Hungary
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Spin chains and spin ladders can have a variety of gapless (critical) or gapped (massive) phases depending on the length of the spin and the type of coupling. A brief review of the results on some simple models is given with emphasis on the generation of the Haldane gap in anisotropic spin ladders.
DOI: 10.12693/APhysPolA.97.81
PACS numbers: 75.10.Jm