Spectral weight contributions of many-particle bound states and continuum

Abstract

Cluster expansion methods are developed for calculating the spectral weight contributions of multiparticle excitations - continuum and bound states - to high orders. A complete 11th order calculation is carried out for the alternating Heisenberg chain. For $\lambda =0.27$, relevant to the material $Cu(N{O}_3{)}_2.2.5D_{2}O$, we present detailed spectral weights for the two-triplet continuum and all bound states. We also examine variation of the relative weights of one and two-particle states with bond alternation from the dimerized to the uniform chain limit.

4 pages, 5 figures, revtex

References in corpus (2)

• Excitations in one-dimensional S=1/2 quantum antiferromagnets
• A neutron scattering study of two-magnon states in the quantum magnet copper nitrate

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• High Order Perturbation Theory for Spectral Densities of Multi-Particle Excitations: S=1/2 Two-Leg Heisenberg Ladder
• Spectral properties of the dimerized and frustrated $S=1/2$ chain
• Raman Response of Magnetic Excitations in Cuprate Ladders and Planes
• Evidence for Dimer Crystal Melting in the Frustrated Spin-Ladder BiCu2PO6
• A modified triplet-wave expansion method applied to the alternating Heisenberg chain