Extra Seminar - Würzburg ToCoTronics Colloquium

Antialtermagnets exhibit nonrelativistic, time-reversal-symmetric, odd-parity spin-split bands [1,2], in stark contrast to the time-reversal-broken, even-parity band structure of altermagnets [3]. The antialtermagnetic spin polarization is ordered perpendicular to the coplanar magnetic order. In this talk, I will discuss the microscopic origin of this distinct spin polarization [4]. I will show that the p-wave spin polarization can be analytically related to the cross product of the magnetic moments and arises from a hidden direct-space order. Our analytical insights provide guiding principles for realizing large spin splittings and strongly spin-polarized bands. Finally, I will illustrate how antiferromagnets can be functionalized into antialtermagnets.

1] Hellenes, Jungwirth, Jaeschke-Ubiergo, Chakraborty, Sinova & Šmejkal. P-wave magnets. arXiv:2309.01607[
2] Chakraborty, Hellenes, Jaeschke-Ubiergo, Jungwirth, Šmejkal & Sinova. Highly efficient non-relativistic Edelstein effect in nodal p-wave magnets. Nat Commun 16, 7270 (2025)
[3] Jungwirth, Sinova, Fernandes, Liu, Watanabe, Murakami, Nakatsuji & Šmejkal. Symmetry, microscopy and spectroscopy signatures of altermagnetism. Nature 649, 837 (2026)
[4] Mitscherling, Priessnitz, Geschner & Šmejkal. Microscopic origin of p-wave magnetism. arXiv:2603.09736