Low-energy excitations in 2-leg and 3-leg quantum spin ladders
arXiv:cond-mat/9711202 · doi:10.1016/S0550-3213(98)00207-7
Abstract
Low-energy excitations in spin 1/2 antiferromagnetic Heisenberg spin ladders are studied by bosonization and gauge theoretical description. It is explicitly shown that zero modes in the bosonization play an essentially important role. Low-energy excitations in the 2-leg system is described by spin triplet Majorana fermions, and in the 3-leg case spin excitations on the top and bottom ladders are described by two massless scalar fields. It is predicted that if inter-ladder interaction between the top and bottom chains is introduced, a phase transition occures at some critical coupling and the system acquires an energy gap.
Latex, 26 pages
References in corpus (3)
Cited by in corpus (3)
- Comment on ``Confinement of slave particles in U(1) gauge theories of strongly interacting electrons"
- N-leg integer-spin ladders and tubes in commensurate external fields -Nonlinear sigma model approach-
- Quantum Spin Chains with Nonlocally-Correlated Random Exchange Coupling and Random-Mass Dirac Fermions