Dynamic properties of spin-1/2 XY chains

Details Dynamic properties of spin-1/2 XY chains Dynamic properties of spin-1/2 XY chains

1998-05-28

arxiv.org/abs/cond-mat/9805370v1

Physics

Condensed Matter

Statistical Mechanics

LaTeX, submitted to J.Phys.Studies(Lviv)

Scientific paper

We have considered a numerical scheme for the calculation of the equilibrium properties of spin-1/2 XY chains. Within its frames it is necessary to solve in the last resort only the 2N\times 2N eigenvalue and eigenvector problem but not the 2^N\times 2^N one as for an arbitrary system consisting of N spins 1/2. To illustrate the approach we have presented some new results. Namely, the xx dynamic structure factor for the Ising model in transverse field, the density of states for the isotropic chain with random intersite couplings and transverse fields that linearly depend on the surrounding couplings, and the zz dynamic structure factor for the Ising model in random transverse field. The results obtained are hopped to be useful for an interpretation of observable data for one-dimensional spin-1/2 XY substances.

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