Wavepacket Approach for Spin Transport in Zigzag Spin Chain
arXiv:2608.04534
Abstract
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.
7 pages, 4 figures, Proceedings of CCP2023 (August 4-8, 2023, Kobe, Japan)