On $c=1$ critical phases in anisotropic spin-1 chains

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dc.creatorBoschi, C. Degli Esposti
dc.creatorErcolessi, E.
dc.creatorOrtolani, F.
dc.creatorRoncaglia, M.
dc.date2003-07-16
dc.date.accessioned2026-07-07T06:29:26Z
dc.date.available2026-07-07T06:29:26Z
dc.descriptionQuantum spin-1 chains may develop massless phases in presence of Ising-like and single-ion anisotropies. We have studied c=1 critical phases by means of both analytical techniques, including a mapping of the lattice Hamiltonian onto an O(2) nonlinear sigma model, and a multi-target DMRG algorithm which allows for accurate calculation of excited states. We find excellent quantitative agreement with the theoretical predictions and conclude that a pure Gaussian model, without any orbifold construction, describes correctly the low-energy physics of these critical phases. This combined analysis indicates that the multicritical point at large single-ion anisotropy does not belong to the same universality class as the Takhtajan-Babujian Hamiltonian as claimed in the past. A link between string-order correlation functions and twisting vertex operators, along the c=1 line that ends at this point, is also suggested.
dc.description9 pages, 3 figures, svjour format, submitted to Eur. Phys. J. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0307396
dc.identifierhttp://arxiv.org/abs/cond-mat/0307396
dc.identifierEur. Phys. J. B 35, 465 (2003)
dc.identifierdoi:10.1140/epjb/e2003-00299-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98031
dc.subjectStrongly Correlated Electrons
dc.titleOn $c=1$ critical phases in anisotropic spin-1 chains
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