Spectral weight contributions of many-particle bound states and continuum

Details Spectral weight contributions of many-particle bound states and continuum Spectral weight contributions of many-particle bound states and continuum

2002-11-16

arxiv.org/abs/cond-mat/0211346v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, revtex

Scientific paper

10.1103/PhysRevLett.91.037206

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 $Cu(NO_3)_2.2.5D_2O$, 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.

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