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arXiv · 2309.01607

P-wave magnets

Anna Birk Hellenes·Tomáš Jungwirth·Rodrigo Jaeschke-Ubiergo·Atasi Chakraborty·Jairo Sinova·Libor Šmejkal
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Abstract

The p-wave Cooper-pairing instability in superfluid $^{3}$He, characterized by a parity-breaking excitation gap, is regarded as one of the most rich and complex phenomena in physics. The possibility of a counterpart unconventional p-wave ordering of interacting fermions, in which a Fermi surface spontaneously breaks the parity symmetry, has been an open problem for many decades. Here we identify the realization of the counterpart of p-wave superfluidity in magnetism. We demonstrate a strong parity-breaking and anisotropic symmetry lowering of spin-polarized and time-reversal symmetric Fermi surfaces in a representative p-wave magnet CeNiAsO. As a direct experimental signature we predict a large spontaneous anisotropy of the resistivity. Abundant and robust realizations of the unconventional p-wave magnetism can be identified from suitable non-relativistic crystal-lattice and spin symmetries, without requiring strong correlations and extreme external conditions. This opens new prospects in fields ranging from topological phenomena to spintronics.

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Anna Birk Hellenes, Tomáš Jungwirth, Rodrigo Jaeschke-Ubiergo, Atasi Chakraborty, Jairo Sinova, Libor Šmejkal. 2023-09-04. P-wave magnets. https://arxiv.org/abs/2309.01607

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