Spin dynamics of a one-dimensional spin-1/2 fully anisotropic Ising-like antiferromagnet in a transverse magnetic field

Abstract

We consider the one-dimensional Ising-like fully anisotropic S=1/2 Heisenberg antiferromagnetic Hamiltonian and study the dynamics of domain wall excitations in the presence of transverse magnetic field $h_x$. We obtain dynamical spin correlation functions along the magnetic field $S^{xx}(q,\omega )$ and perpendicular to it $S^{yy}(q,\omega )$. It is shown that the line shapes of $S^{xx}(q,\omega )$ and $S^{yy}(q,\omega )$ are purely symmetric at the zone-boundary. It is observed in $S^{yy}(q,\omega )$ for $\pi /2<q<\pi$ that the spectral weight moves toward low energy side with the increase of $h_x$. This model is applicable to study the spin dynamics of CsCoCl${}_3$ in the presence of weak interchain interactions.

19 pages, LaTeX, 12 eps figures

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