锯齿形自旋链中自旋输运的波包方法
Wavepacket Approach for Spin Transport in Zigzag Spin Chain
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中文总结 AI 辅助
采用含时密度矩阵重整化群方法，结合周期性边界条件，研究磁场下阻挫锯齿形自旋链中自旋向列液体的自旋输运，发现饱和时动量k=π的磁子对波包因无能隙色散平坦而局域化。
中文摘要 AI 辅助
我们采用含时密度矩阵重整化群方法，从波包时间演化的视角，研究磁场下阻挫锯齿形自旋链中自旋向列液体的自旋输运性质。我们使用周期性边界条件，以避免开放边界条件下由边缘诱导的磁化结构。研究发现，在饱和时，动量k=π的磁子对波包保持局域化，这是由于反铁电四极准长程序导致的无能隙色散具有相当平坦的结构，表明其传播速度为零。
英文摘要
We study the spin transport property of a spin nematic liquid in a frustrated zigzag spin chain in a magnetic field from the perspective of the time evolution of wavepackets by a time-dependent density-matrix renormalization group method. We use the periodic boundary condition to avoid an edge-induced magnetization structure in the open boundary condition. We find that at the saturation, a magnon-pair wavepacket of momentum k=pi stays localized, since the gapless dispersion due to the antiferro-quadrupole quasi-long-range order has a rather flat structure, indicating zero propagation velocity.
