Phys. Rev. Lett. 101, 137202 (2008) [4 pages]Kramers Degeneracy in a Magnetic Field and Zeeman Spin-Orbit Coupling in Antiferromagnetic Conductors
See accompanying Physics Synopsis In this Letter, I study the magnetic response of electron wave functions in a commensurate collinear antiferromagnet. I show that, at a special set of momenta, hidden antiunitary 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.137202
DOI:
10.1103/PhysRevLett.101.137202
PACS:
75.10.Hk, 75.25.+z, 75.50.Ee
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