Wavepacket Approach for Spin Transport in Zigzag Spin Chain
The study investigates spin transport in a frustrated zigzag spin chain using wavepacket dynamics via time-dependent density-matrix renormalization group. It shows that magnon pairs propagate and localize differently based on boundary conditions. Specifically, at saturation, a momentum k=π magnon pair wavepacket remains localized because the gapless dispersion has a flat structure, implying zero propagation velocity.