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arXiv 0712.3189cond-mat.stat-mech
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量子Ising自旋链铁磁体中束缚自旋子的能谱

Energy spectrum of bound-spinons in the quantum Ising spin-chain ferromagnet

S. B. Rutkevich

摘要:

研究了易磁化轴为z的S=1/2铁磁Ising自旋链在磁场h={h_x,0,h_z}中的激发能谱.根据Wu和McCoy的弱约束方案,在有序相中,在h_z = 0处自由的费米子自旋激发(扭结)在任意小的h_z处耦合成玻色子束缚态。我们用伊辛场论中为解决类似问题而发展的不同微扰方法,计算了小h_z下首阶激发的能谱。

英文摘要:

We study the excitation energy spectrum in the S=1/2 ferromagnetic Ising spin chain with the easy axis z in a magnetic field h={h_x,0,h_z}. According to Wu and McCoy's scenario of weak confinement, the fermionic spinon excitations (kinks), being free at h_z = 0 in the ordered phase, are coupled into bosonic bound states at arbitrary small h_z. We calculate the energy spectrum of such excitations in the leading order in small h_z, using different perturbative methods developed for the similar problem in the Ising field theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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