Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

Details Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

2008-05-03

arxiv.org/abs/0805.0378v2

Phys. Rev. Lett. 101, 137202 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

published version

Scientific paper

10.1103/PhysRevLett.101.137202

In this article, I study magnetic response of electron wavefunctions in a commensurate collinear antiferromagnet. I show that, at a special set of momenta, hidden anti-unitary symmetry protects Kramers degeneracy of Bloch eigenstates against a magnetic field, pointing transversely to staggered magnetization. Hence a substantial momentum dependence of the transverse g-factor in the Zeeman term, turning the latter into a spin-orbit coupling, that may be present in materials from chromium to borocarbides, cuprates, pnictides, as well as organic and heavy fermion conductors.

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