Dynamical quadrupole structure factor of frustrated ferromagnetic chain
arXiv:1806.01434 · doi:10.1016/j.physb.2017.10.056
Abstract
We investigate the dynamical quadrupole structure factor of a spin-1/2 - Heisenberg chain with competing ferromagnetic and antiferromagnetic in a magnetic field by exploiting density-matrix renormalization group techniques. In a field-induced spin nematic regime, we observe gapless excitations at according to quasi-long-range antiferro-quadrupole correlations. The gapless excitation mode has a quadratic form at the saturation, while it changes into a linear dispersion as the magnetization decreases.
7 pages, 3 figures, Proceedings of SCES2017 (September 17-21, 2017, Prague, Czech Republic)
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