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

Research output: Contribution to journalJournal article

Published

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Journal publication date11/2009
JournalPhysical Review B
Journal number20
Volume80
Number of pages4
Pages-
Original languageEnglish

Abstract

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.

Bibliographic note

© 2009 The American Physical Society