| Affiliation: | (1) International School for Advanced Studies, Via Beirut 4, 34014 Trieste, Italy;(2) The Abdus Salam International Centre for Theoretical Physics, P.O. Box 586, 34100 Trieste, Italy;(3) The Andronikashvili Institute of Physics, Tamarashvili 6, 380077 Tbilisi, Georgia |
| Abstract: | Using bosonization approach, we derive an effective low-energy theory for XXZ-symmetric spin-1/2 zigzag ladders and discuss its phase diagram by a variational approach. A spin nematic phase emerges in a wide part of the phase diagram, either critical or massive. Possible crossovers between the spontaneously dimerized and spin nematic phases are discussed, and the topological excitations in all phases identified.Received: 14 August 2004, Published online: 29 June 2004PACS: 75.10.Pq Spin chain models - 75.40.-s Critical-point effects, specific heats, short-range order - 75.30.Gw Magnetic anisotropy - 71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) |
