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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Formato: | Articulo |
Lenguaje: | Inglés |
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2001
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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 |
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I19-R120-10915-104431 |
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institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
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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 |
work_keys_str_mv |
AT cabradanielcarlos nonperturbativeeffectivefieldtheoryfortwolegantiferromagneticspinladders AT dobryarieloscar nonperturbativeeffectivefieldtheoryfortwolegantiferromagneticspinladders AT rossinigerardoluis nonperturbativeeffectivefieldtheoryfortwolegantiferromagneticspinladders |
bdutipo_str |
Repositorios |
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1764820442287177729 |