3 research outputs found
A generalized spin ladder in a magnetic field
We study the phase diagram of coupled spin-1/2 chains with bilinear and
(chiral) three-spin exchange interactions in a magnetic field. The model is
soluble on a one-parametric line in the space of coupling constants connecting
the limiting cases of a single and two decoupled Heisenberg chains with nearest
neighbour exchange only. We give a complete classification of the low-energy
properties of the integrable system and introduce a numerical method which
allows to study the possible phases of spin ladder systems away from the
soluble line in a magnetic field.Comment: Latex2e, 13 pp., 5 figure
Properties of the chiral spin liquid state in generalized spin ladders
We study zero temperature properties of a system of two coupled quantum spin
chains subject to fields explicitly breaking time reversal symmetry and parity.
Suitable choice of the strength of these fields gives a model soluble by Bethe
Ansatz methods which allows to determine the complete magnetic phase diagram of
the system and the asymptotics of correlation functions from the finite size
spectrum. The chiral properties of the system for both the integrable and the
nonintegrable case are studied using numerical techniques.Comment: 19 pages, 9eps figures, Late