Relation between high-energy quasiparticles of quasi-one-dimensional antiferromagnets in a magnetic field and a doublon of a Hubbard chain
Relation between high-energy quasiparticles of quasi-one-dimensional antiferromagnets in a magnetic field and a doublon of a Hubbard chain
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磁场中准一维反铁磁体的高能准粒子与哈伯德链双布朗之间的关系
DOI：
10.1088/1742-6596/320/1/012021
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Masanori Kohno
中科院分区：
文献类型：
--
作者：
藤本巧;光田 暁弘;和田 裕文;Kenji Yonemitsu and Keita Nishioka;Masanori Kohno
在自旋为1/2的一维海森堡反铁磁体和各向异性的三角形海森堡反铁磁体中，利用非弹性中子散射在磁场中观察到具有相当谱权的高能态。这种高能性质既不能用连续对称性自发破断的Nambu-Goldstone玻色子来解释，也不能用Tomonaga-Luttinger液体中的准粒子来解释。在这里，我们通过从理论上追溯高能态的起源到Bethe ansatz的弦解，证明了导致高能态的机制类似于一维Hubbard模型中的上Hubbard带。
In spin-1/2 one-dimensional Heisenberg antiferromagnets and anisotropic triangular Heisenberg antiferromagnets, high-energy states carrying considerable spectral weights have been observed in a magnetic field using inelastic neutron scattering. Such high-energy properties cannot be explained in terms of either Nambu-Goldstone bosons due to spontaneous breaking of continuous symmetries or quasiparticles in a Tomonaga-Luttinger liquid. Here, we show that the mechanism causing the high-energy states is analogous to that of the upper Hubbard band in the one-dimensional Hubbard model, by theoretically tracing the origin of the high-energy states back to string solutions of the Bethe ansatz.