One-dimensional spin-liquid without magnon excitations

Details One-dimensional spin-liquid without magnon excitations One-dimensional spin-liquid without magnon excitations

1996-12-02

arxiv.org/abs/cond-mat/9612014v2

Physics

Condensed Matter

9 pages, LaTex, to be published in Phys. Rev. Lett., vol. 78, May 1997

Scientific paper

10.1103/PhysRevLett.78.3939

It is shown that a sufficiently strong four-spin interaction in the spin-1/2 spin ladder can cause dimerization. Such interaction can be generated either by phonons or (in the doped state) by the conventional Coulomb repulsion between the holes. The dimerized phases are thermodynamically undistinguishable from the Haldane phase, but have dramatically different correlation functions: the dynamical magnetic susceptibility, instead of displaying a sharp single magnon peak near $q = \pi$, shows only a two-particle threshold separated from the ground state by a gap.

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