Transport evidence of current-induced nematic Dirac valleys in a parity-time-symmetric antiferromagnet.

ABSTRACT: Itinerant antiferromagnets with broken time-reversal symmetry have recently attracted attention, since their spin-split bands enable large magnetotransport responses comparable to ferromagnets despite the negligible spontaneous magnetisation. When the inversion symmetry is further broken by the antiferromagnetic order, the emerging odd-parity multipole order renders the bands spin-degenerate but asymmetric in the momentum space. For such parity-time-symmetric antiferromagnets, it has been predicted that electronic nematicity is induced by current, allowing unconventional nonlinear transport phenomena. However, their experimental evidence has been lacking. Here, we report two-fold nonreciprocal angular magnetoresistance in the tetragonal layered Dirac material SrMnBi₂ with parity

SUBMITTER: Sakai H 

PROVIDER: S-EPMC12780245 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature