S. Sandhoefner https://orcid.org/0000-0003-4238-7277
Date of this Version
PHYSICAL REVIEW RESEARCH 2, 013079 (2020)
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 nonconserved, but for certain symmetries and spin polarizations the averaged effect of nonconserving 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.