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
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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
T. Giamarchi
中科院分区:
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文献类型:
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作者:
M. Zvonarev;V. Cheianov;T. Giamarchi

文献摘要

被引文献

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研究了自旋1/2玻色子系统在任意粒子间斥力强度下的动态自旋结构因子S(k, ω)。作为ω的函数,它在给定k时由磁振子的能量定义的阈值频率处显示出幂律奇点。幂律指数是使用Bethe ansatz解和有效场理论方法的组合精确地找到的。
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.