Sound Velocity and Meissner Effect in Light-heavy Fermion Pairing Systems

Abstract

In the frame of a four fermion interaction theory, we investigated the collective excitation in light-heavy fermion pairing systems. When the two species of fermions posses different masses and chemical potentials but keep the same Fermi surface, we found that the sound velocity in superfluids and the Meissner mass or inverse penetration depth in superconductors have the same mass ratio dependence as the ratio of the transition temperature to the zero temperature gap.

4 pages, 2 figures, accepted for publication in PRB as a Rapid Communication

References in corpus (6)

• Chromomagnetic instability in dense quark matter
• Screening masses in neutral two-flavor color superconductor
• The Meissner Effect in a Two Flavor LOFF Color Superconductor
• Paramagnetic Meissner Effect and Finite Spin Susceptibility in an Asymmetric Superconductor
• Phase Transition in Asymmetrical Superfluids I: Equal Fermi Surfaces
• Effective theory of excitations in a Feshbach resonant superfluid

Cited by in corpus (4)

• BEC-BCS Crossover of a Trapped Two-Component Fermi Gas with Unequal Masses
• Fermion Cooper Pairing with Unequal Masses: Standard Field Theory Approach
• Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice
• First sound velocity in liquid ${}^4$He