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arXiv · 0905.0598

Edge exponent in the dynamic spin structure factor of the Yang-Gaudin model

M. B. Zvonarev·V. V. Cheianov·T. Giamarchi
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Abstract

The dynamic spin structure factor $\mathcal{S}(k,\omega)$ of a system of spin-1/2 bosons is investigated at arbitrary strength of interparticle repulsion. As a function of $\omega$ it is shown to exhibit a power-law singularity at the threshold frequency defined by the energy of a magnon at given $k.$ The power-law exponent is found exactly using a combination of the Bethe Ansatz solution and an effective field theory approach.

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M. B. Zvonarev, V. V. Cheianov, T. Giamarchi. 2009-05-05. Edge exponent in the dynamic spin structure factor of the Yang-Gaudin model. https://doi.org/10.1103/physrevb.80.201102

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