Effects of incipient pairing on nonequilibrium quasiparticle transport in Fermi liquids

Abstract The low-temperature properties of a wide range many-fermion systems spanning metals, quantum gases and liquids to nuclear matter are well understood within the framework Landau’s theory Fermi liquids. low-energy physics these is governed by interacting fermionic quasiparticles with momenta energies near surface in momentum space. Nonequilibrium described kinetic equation for distribution function proposed Landau. Quasiparticle interactions other quasiparticles, phonons, or impurities lead internal forces acting on nonequilibrium as collision processes that ultimately limit transport mass, heat, charge, magnetization, limiting coherence times quasiparticles. For close second-order phase transition, e.g., undergo superfluid incipient Cooper pairs—long-lived fluctuations ordered phase—provide new channel scattering corrections We develop quasiparticle vicinity BCS-type transition starting from Keldysh’s field nonequilibrium, strongly fermions. leading Fermi-liquid instability arise virtual emission absorption pairs. Our applicable superconductors, matter, phases liquid 3He. As an implementation we calculate pairing-fluctuation attenuation zero sound 3He demonstrate quantitative agreement experimental results.