Spectrum and transition rates of the XX chain analyzed via Bethe ansatz

Spectrum and transition rates of the XX chain analyzed via Bethe ansatz
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通过 Bethe ansatz 分析 XX 链的光谱和转移率

DOI:
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发表时间:
2003
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通讯作者:
K. Wiele
K. Wiele
中科院分区:
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文献类型:
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作者:
Daniel Biegel;M. Karbach;G. Muller;K. Wiele

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作为研究S=1/2XXZ模型在平面区域|Delta|<1中动力学性质的一部分,我们讨论了Delta=0(XX模型)情形下Bethe ansatz方程的奇异性质。我们确定了整个XX谱的Bethe ansatz解的一般结构,其中包括具有实磁振子动量和复磁振子动量的态。我们讨论了自旋或磁振子准粒子(Bethe Ansatz)和晶格费米子(Jordan-Wigner表示)之间的关系。我们给出了Bethe波函数之间自旋涨落算符跃迁速率的行列式表达式,并将其化为乘积表达式。我们将新公式应用于N=4096位的链的双自旋子跃迁几率。
As part of a study that investigates the dynamics of the s=1/2 XXZ model in the planar regime |Delta|<1, we discuss the singular nature of the Bethe ansatz equations for the case Delta=0 (XX model). We identify the general structure of the Bethe ansatz solutions for the entire XX spectrum, which include states with real and complex magnon momenta. We discuss the relation between the spinon or magnon quasiparticles (Bethe ansatz) and the lattice fermions (Jordan-Wigner representation). We present determinantal expressions for transition rates of spin fluctuation operators between Bethe wave functions and reduce them to product expressions. We apply the new formulas to two-spinon transition rates for chains with up to N=4096 sites.