Edge exponent in the dynamic spin structure factor of the Yang-Gaudin model
Edge exponent in the dynamic spin structure factor of the Yang-Gaudin model
复制标题
Yang-Gaudin模型动态自旋结构因子中的边缘指数
DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
T. Giamarchi
中科院分区:
文献类型:
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作者:
M. Zvonarev;V. Cheianov;T. Giamarchi
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.