Journal
PHYSICAL REVIEW B
Volume 80, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.201102
Keywords
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Funding
- Swiss National Science Foundation
- MaNEP
- ESF
- INSTANS program
- Engineering and Physical Sciences Research Council [EP/C509358/1] Funding Source: researchfish
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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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