https://doi.org/10.1140/epjb/e2004-00180-3
Ordered phases of XXZ-symmetric spin-1/2 zigzag ladder
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
Corresponding author: a fabrizio@sissa.it
Received:
14
August
2004
Published online:
29
June
2004
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.
PACS: 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.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
