We investigate the intrinsic magnon spin current in a noncollinear antiferromagnetic insulator. We introduce a definition of the magnon spin current in a noncollinear antiferromagnet and find that it is in general non-conserved, but for certain symmetries and spin polarizations the averaged effect of non-conserving terms can vanish. We formulate a general linear response theory for magnons in noncollinear antiferromagnets subject to a temperature gradient and analyze the effect of symmetries on the response tensor. We apply this theory to single-layer potassium iron jarosite KFe3(OH)6(SO4)2 and predict a measurable spin current response.
@article{arxiv.1907.10567,
title = {Intrinsic spin Nernst effect of magnons in a noncollinear antiferromagnet},
author = {Bo Li and Shane Sandhoefner and Alexey A. Kovalev},
journal= {arXiv preprint arXiv:1907.10567},
year = {2020}
}