About influence of conformational degrees of freedom on spectra of collective excitations in disordered superfluid A-phase of 3He

The dynamic equations of Fermi superfluid with conformational degrees of freedom are considered, which generalize description of nonequilibrium processes of disordered A-phase of 3He to states with an arbitrary spatial part of order parameter. The spectra of collective excitations are found taking i...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2025-01, Vol.51 (1), p.21-28
Main Authors: Kovalevsky, M. Yu, Rozhkov, A. A.
Format: Article
Language:English
Subjects:
Anisotropy
Degrees of freedom
Excitation spectra
Fluids
Liquid crystals
Order parameters
Superfluidity
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Summary:The dynamic equations of Fermi superfluid with conformational degrees of freedom are considered, which generalize description of nonequilibrium processes of disordered A-phase of 3He to states with an arbitrary spatial part of order parameter. The spectra of collective excitations are found taking into account elasticity of Fermi superfluid with these degrees of freedom, and their spatial anisotropy have been analyzed. It is shown that such degrees of freedom lead to positive anisotropic corrections in acoustic spectra of the first and second sounds, for which their angular dependence is established. It was found appearance of anisotropic third and fifth sounds, which are caused by liquid crystalline degrees of freedom in disordered superfluid A-phase of 3He.
ISSN:1063-777X
1090-6517
DOI:10.1063/10.0034555