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

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Article number201102
<mark>Journal publication date</mark>11/2009
<mark>Journal</mark>Physical review B
Issue number20
Number of pages4
Pages (from-to)-
Publication StatusPublished
<mark>Original language</mark>English


The dynamic spin structure factor S(k,omega) of a system of spin-1/2 bosons is investigated at arbitrary strength of the 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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© 2009 The American Physical Society