Spiral phase of a doped antiferromagnet.
Spiral phase of a doped antiferromagnet.
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掺杂反铁磁体的螺旋相。
DOI：
10.1103/physrevb.45.10419
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Fulde
中科院分区：
文献类型：
--
作者：
Igarashi;Fulde
螺旋相的稳定性进行了研究，在低掺杂浓度的t-J模型。一个绿色的功能形式主义是基于一个从费米子Schwinger玻色子表示在扭曲的本地坐标系。螺旋调制，这是治疗内的自洽玻恩近似，引起分裂的准空穴带，导致一个稳定的螺旋相位。螺旋相的波数的计算，并示出增加与减小比J/t。我们还研究了螺旋调制对自旋波的影响。动量平行于调制矢量的自旋波强烈地耦合到具有激发间隙的电子-空穴对。由此产生的杂化模式的指定，并指出强重整化的自旋波速度。
The stability of the spiral phase is studied in the t-J model for low doping concentrations. A Green's-function formalism is used that is based on a slave-fermion Schwinger-boson representation in a twisted local coordinate frame. The spiral modulation, which is treated within the self-consistent Born approximation, gives rise to a splitting of the band of quasiholes, leading to a stable spiral phase. The wave number of the spiral phase is calculated, and shown to increase with decreasing ratio J/t. We also study the effects of the spiral modulation on spin waves. Spin waves with momenta parallel to the modulation vector couple strongly to electron-hole pairs that have an excitation gap. The resulting hybridized modes are specified, and the strong renormalization of the spin-wave velocity is pointed out.