Dependence of quasiparticle scattering length of Andreev reflection from a vortex line to the relevant parameters in polarized superfluid Fermi gas with normal-superfluid phase separation

neda ebrahimian | R. Afzali | M. Afsharfar

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=159387
Date :  2022/02/25
Publish in :    The European Physical Journal Plus
DOI :  https://doi.org/10.1140/epjp/s13360-022-02388-1
Link :  http://dx.doi.org/10.1140/epjp/s13360-022-02388-1
Keywords :superfluid, Andreev, fermi gas

Abstract :

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We consider a mass-asymmetric ultracold polarized Fermi gas accompanied by the occurrence of normal-superfluid phase separation. By considering Andreev reflection of the thermal excitations or quasiparticles from a vortex line and the energy branch of quasiparticle states, which is composed of particles with spin up and holes with spin down accompanied by different masses, we calculate the passing flux of the quasiparticle moving in a vortex per unit time. Finally, we calculate and analyze the probabilities of Andreev reflected fraction of the energy flux and the corresponding scattering lengths, which are defined as the scattering cross section per unit length of the vortex line, as a function of the impact parameter, the average chemical potential, the imbalance chemical potential, the temperature, the interaction strength and the mass ratio. We prove that the probabilities and scattering lengths can be controlled by the relevant physical parameters of the superfluid polarized Fermi gas.