Abstract
The time reversal symmetric polar phase of the spin-triplet superfluid 3He has two types of Dirac nodal lines. In addition to the Dirac loop in the spectrum of the fermionic Bogoliubov quasiparticles in the momentum space (p x , p y , p z ), the spectrum of bosons (magnons) has Dirac loop in the 3D space of parameters—the components of magnetic field (H x ,H y ,H z ). The bosonic Dirac system lives on the border between the type-I and type-II.
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Volovik, G.E. Polar Phase of Superfluid 3He: Dirac Lines in the Parameter and Momentum Spaces. Jetp Lett. 107, 324–326 (2018). https://doi.org/10.1134/S002136401805003X
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DOI: https://doi.org/10.1134/S002136401805003X