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VOLUME 105 (2017) | ISSUE 11 | PAGE 691
Fermi points and the Nambu sum rule in the polar phase of 3He1)
DOI: 10.7868/S0370274X17110078
Abstract
We discuss the polar phase of 3He, which is realized in the anisotropic aerogel. We consider it in the framework of the BCS model. In the absence of the spin-orbit interaction this model predicts the appearance of the Fermi line. However, it is topologically unstable. We demonstrate, that the spin-orbit interaction gives rise to the appearance of the two Fermi points instead of the Fermi line. In addition to the gapless Nambu-Goldstone bosons in this system the collective gapped bosonic states exist. Their gaps are calculated, and the corresponding Nambu sum rule is established.


 
Supplemental files
11zub-d.pdf