Roton minimum as fingerprint of magnon-Higgs scattering in ordered quantum antiferromagnets
Strongly Correlated Electrons
2015-11-13 v2
Abstract
A quantitative description of magnons in long-range ordered quantum antiferromagnets is presented which is consistent from low to high energies. It is illustrated for the generic Heisenberg model on the square lattice. The approach is based on a continuous similarity transformation in momentum space using the scaling dimension as truncation criterion. Evidence is found for significant magnon-magnon attraction inducing a Higgs resonance. The high-energy roton minimum in the magnon dispersion appears to be induced by strong magnon-Higgs scattering.
Keywords
Cite
@article{arxiv.1504.07371,
title = {Roton minimum as fingerprint of magnon-Higgs scattering in ordered quantum antiferromagnets},
author = {M. Powalski and G. S. Uhrig and K. P. Schmidt},
journal= {arXiv preprint arXiv:1504.07371},
year = {2015}
}
Comments
10 pages, 3 figures