Bose-Einstein condensation of magnons and spin superfluidity in the polar phase of ${}^3$He

S. Autti, V. V. Dmitriev, J. T. Mäkinen +5

The polar phase of ${}^3$He, which is topological spin-triplet superfluid with the Dirac nodal line in the spectrum of Bogolubov quasiparticles, has been recently stabilized in a nan…