Supermagnonic propagation in two-dimensional antiferromagnets
arXiv:2101.10945 · doi:10.1103/PhysRevLett.127.097202
Abstract
We investigate the propagation of magnons after ultrashort perturbations of the exchange interaction in the prototype two-dimensional Heisenberg antiferromagnet. Using the recently proposed neural quantum states, we predict highly anisotropic spreading in space constrained by the symmetry of the perturbation. Interestingly, the propagation speed at the shortest length and time scale is up to 40% higher than the highest magnon velocity. We argue that the enhancement stems from extraordinary strong magnon-magnon interactions, suggesting new avenues for manipulating information transfer on ultrashort length and time scales.
arXiv comment5 pages, 3 figures and supplemental materials. Updates: abstract, introduction, Fig. 3 and discussion about Fig. 3, Figs. S1-S2. Additional results on entanglement dynamics can be found in arXiv:1912.10845
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