About anomalous superfluidity, superconductivity and ferromagnetism in nuclear systems
Seminars
Seminar “Theory of Hadronic Matter under Extreme Conditions”
Date and Time: Wednesday, 16 June 2021, at 4:00 PM
Venue: Online conference in Zoom, Bogoliubov Laboratory of Theoretical Physics
Seminar topic: “About anomalous superfluidity, superconductivity and ferromagnetism in nuclear systems”
Speaker: D. N. Voskresensky
Abstract:
First, I’ll remind superfluid and superconducting properties of the condensate of the complex scalar field. A possibility of s-wave pion condensate and 1S0 nn and pp pairings in baryon matter will be discussed. Response on external static magnetic field (Abrikosov filamentary lattice) and rotation, will be considered. Then I discuss peculiarities of superfluid and superconducting boson sub-systems obeying roton-like spectrum. As an example, p-wave pion condensation in baryon matter and specificity of the behaviour of the charged pion condensate in external static magnetic field will be discussed. Some similarities in the description of cold two-component dipolar gases and pion condensate will be mentioned. Then focus will be made on the study of phases of the complex neutral and charged vector boson coupled with the magnetic field by the Zeeman coupling. I will discuss the presence of nonmagnetic and ferromagnetic superfluid phases. It will be shown that in a strong magnetic field spin-triplet pairing and ferromagnetic superfluidity continue to exist above the “old” phase-transition critical temperature. The spin-triplet pairing of neutral and charged fermions at negligible spin-orbital interaction will be similarly considered. Then various sub-phases of 3P2 nn, pp and 3S1 np pairings in baryon matter will be described. A possibility of various colour superconducting phases will be mentioned. Some estimates will be done in the BCS limit and beyond.