Dynamical Structure Factor in Cu Benzoate and other spin-1/2 antiferromagnetic chains

TL;DR

This paper analyzes the dynamical structure factor in Cu Benzoate, a spin-1/2 antiferromagnetic chain, revealing how magnetic fields induce gaps and affect neutron scattering intensities, using effective field theory.

Contribution

It provides a theoretical calculation of spectral weight ratios for neutron scattering peaks in Cu Benzoate under magnetic fields, based on a low-energy effective field theory.

Findings

Magnetic field induces a gap in Cu Benzoate.

Neutron scattering peaks appear at antiferromagnetic and incommensurate wave numbers.

Spectral weight ratios are quantitatively determined.

Abstract

Recent experiments of the quasi-one-dimensional spin-1/2 antiferromagnet Copper Benzoate established the existence of a magnetic field induced gap. The observed neutron scattering intensity exhibits resolution limited peaks at both the antiferromagnetic wave number and at incommensurate wave numbers related to the applied magnetic field. We determine the ratio of spectral weights of these peaks within the framework of a low-energy effective field theory description of the problem.