Dependence of interface conductivity on relevant physical parameters in polarized Fermi mixtures

Abstract

We consider a mass-asymmetric polarized Fermi system in the presence of Hartree-Fock (HF) potentials. We concentrate on the BCS regime with various interaction strengths and numerically obtain the allowed values of the chemical and HF potentials, as well as the mass ratio. The functional dependence of the heat conductivity of the N-SF interface on relevant physical parameters, namely the temperature, the mass ratio, and the interaction strength, is obtained. In particular, we show that the interface conductivity starts to drop with decreasing temperature at the temperature, $T_{\text{m}}$, where the mean kinetic energy of the particles is just sufficient to overcome the SF gap. We obtain $T_{\text{m}}$ as a function of the mass ratio and the interaction strength. The variation of the heat conductivity, at fixed temperature, with the HF potentials and the imbalance chemical potential is also obtained. Finally, because the range of relevant temperatures increases for larger values of the mass ratio, we consider the ${}^6\text{Li}$-${}^{40}\text{K}$ mixture separately by taking the temperature dependence of the pair potential into account.

To appear in Physica C (2012)

References in corpus (13)

• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Normal state of a polarized Fermi gas at unitarity
• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
• Universal Properties of the Ultra-Cold Fermi Gas
• Phase diagram of a cold polarized Fermi gas
• Induced P-wave Superfluidity in Asymmetric Fermi Gases
• Surface Tension in Unitary Fermi Gases with Population Imbalance
• Population and mass imbalance in atomic Fermi gases
• Normal-Superfluid Interface Scattering For Polarized Fermion Gases
• Normal-Superfluid Interface for Polarized Fermion Gases
• Linear response of heat conductivity of normal-superfluid interface of a polarized Fermi gas to orbital magnetic field