Rights statement: © 2009 The American Physical Society
Final published version, 147 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 201102 |
|---|---|
| <mark>Journal publication date</mark> | 11/2009 |
| <mark>Journal</mark> | Physical review B |
| Issue number | 20 |
| Volume | 80 |
| Number of pages | 4 |
| Pages (from-to) | - |
| Publication Status | Published |
| <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.