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dc.date.accessioned 2020-09-11T15:32:39Z
dc.date.available 2020-09-11T15:32:39Z
dc.date.issued 2001
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/104431
dc.description.abstract We study the long wavelength limit of a spin-½ Heisenberg antiferromagnetic two-leg ladder, treating the interchain coupling in a nonperturbative way. We perform a mean field analysis and then include the fluctuations in an exact way. This allows for a discussion of the phase diagram of the system and provides an effective-field theory for the low-energy excitations. The coset fermionic Lagrangian obtained corresponds toa perturbed SU(4)1 / U(1) conformal field theory (CFT). This effective theory is naturally embedded in a SU(2)2 x Z2 CFT, where perturbations are easily identified in terms of conformal operators in the two sectors. Crossed and zigzag ladders are also discussed using the same approach. en
dc.language en es
dc.subject antiferromagnetic Heisenberg spin ladders es
dc.subject field theory es
dc.title Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders en
dc.type Articulo es
sedici.identifier.uri http://hdl.handle.net/11336/98120 es
sedici.identifier.uri https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.144408 es
sedici.identifier.other http://dx.doi.org/10.1103/PhysRevB.63.144408 es
sedici.identifier.other hdl:11336/98120 es
sedici.identifier.issn 0163-1829 es
sedici.creator.person Cabra, Daniel Carlos es
sedici.creator.person Dobry, Ariel Oscar es
sedici.creator.person Rossini, Gerardo Luis es
sedici.subject.materias Ciencias Exactas es
sedici.subject.materias Física es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Physical Review B es
sedici.relation.journalVolumeAndIssue vol. 63, no. 14 es


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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Excepto donde se diga explícitamente, este item se publica bajo la siguiente licencia Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)