2023/09/04 by Anna Birk Hellenes, T. Jungwirth, Hellenes, Anna Birk +5 · 8 citations
Physics and Astronomy · #Quantum, superfluid, helium dynamics #Physics of Superconductivity and Magnetism #Atomic and Subatomic Physics Research
paper · pdf · doi:10.48550/arxiv.2309.01607
The p-wave Cooper-pairing instability in superfluid 3He, 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.