Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders

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...

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Autores principales: Cabra, Daniel Carlos, Dobry, Ariel Oscar, Rossini, Gerardo Luis
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Exactas
Física
antiferromagnetic Heisenberg spin ladders
field theory
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/104431
http://hdl.handle.net/11336/98120
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.144408
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-104431
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
antiferromagnetic Heisenberg spin ladders
field theory
spellingShingle Ciencias Exactas
Física
antiferromagnetic Heisenberg spin ladders
field theory
Cabra, Daniel Carlos
Dobry, Ariel Oscar
Rossini, Gerardo Luis
Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
topic_facet Ciencias Exactas
Física
antiferromagnetic Heisenberg spin ladders
field theory
description 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)<sub>1</sub> / U(1) conformal field theory (CFT). This effective theory is naturally embedded in a SU(2)<sub>2</sub> x Z<sub>2</sub> 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.
format Articulo
Articulo
author Cabra, Daniel Carlos
Dobry, Ariel Oscar
Rossini, Gerardo Luis
author_facet Cabra, Daniel Carlos
Dobry, Ariel Oscar
Rossini, Gerardo Luis
author_sort Cabra, Daniel Carlos
title Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
title_short Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
title_full Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
title_fullStr Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
title_full_unstemmed Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
title_sort nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/104431
http://hdl.handle.net/11336/98120
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.144408
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AT rossinigerardoluis nonperturbativeeffectivefieldtheoryfortwolegantiferromagneticspinladders
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