Research output: Contribution to journal › Journal article
|Journal publication date||11/2009|
|Journal||Physical Review B|
|Number of pages||4|
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.