| dc.creator | Cabra, Daniel Carlos | |
| dc.creator | Dobry, Ariel Oscar | |
| dc.creator | Rossini, Gerardo Luis | |
| dc.date | 2001 | |
| dc.date | 2020-09-11T15:32:39Z | |
| dc.date.accessioned | 2023-07-14T22:00:50Z | |
| dc.date.available | 2023-07-14T22:00:50Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/104431 | |
| dc.identifier | http://hdl.handle.net/11336/98120 | |
| dc.identifier | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.144408 | |
| dc.identifier | issn:0163-1829 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7445273 | |
| dc.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. | |
| dc.description | Facultad de Ciencias Exactas | |
| dc.format | application/pdf | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Exactas | |
| dc.subject | Física | |
| dc.subject | antiferromagnetic Heisenberg spin ladders | |
| dc.subject | field theory | |
| dc.title | Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders | |
| dc.type | Articulo | |
| dc.type | Articulo | |
