Approximate Decoupling of Spin and Charge Excitations in the Two-Dimensional t-J Model.
Approximate Decoupling of Spin and Charge Excitations in the Two-Dimensional t-J Model.
复制标题
二维 t-J 模型中自旋和电荷激发的近似解耦。
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
S. Maekawa
中科院分区：
文献类型：
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作者：
T. Tohyama;S. Maekawa
利用精确对角化技术，结合自旋和电荷动力学研究了二维t-J模型的单粒子谱函数。在低电子密度下，观察到费米液体行为。在半填充附近，谱函数呈现双峰结构，这是由于自旋自由度和电荷自由度的动力学性质不同。这种密度依赖性的光谱函数表明，从费米液体行为在低密度的Mott过渡附近的自旋和电荷激发的近似去耦发生的异常行为的交叉。
The single-particle spectral functions for the two-dimensional t - J model are investigated in connection with spin and charge dynamics, using the exact diagonalization technique. At low electron density, Fermi liquid behavior is observed. Near half-filling, the spectral functions reveal a two-peak structure which is due to the different dynamics of spin and charge degrees of freedom. This density dependence of the spectral functions indicates a crossover from Fermi liquid behavior at low density to anomalous behavior near the Mott transition where the approximate decoupling of spin and charge excitations occurs.