Papers › Quasiparticle disintegration in fermionic superfluids
Quasiparticle disintegration in fermionic superfluids
Senne Van Loon, Jacques Tempere, Hadrien Kurkjian
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We study the fermionic quasiparticle spectrum in a zero-temperature superfluid Fermi gas, and in particular how it is modified by different disintegration processes. On top of the disintegration by emission of a collective boson (1→2, subject of a previous study, PRL 124, 073404), we consider here disintegration events where three quasiparticles are emitted (1→3). We show that both disintegration processes are described by a t-matrix self-energy (as well as some highly off-resonant vacuum processes), and we characterize the associated disintegration continua. At strong coupling, we show that the quasiparticle spectrum is heavily distorted near the 1→3 disintegration threshold. Near the dispersion minimum, where the quasiparticles remain well-defined, the main effect of the off-shell disintegration processes is to shift the location of the minimum by a value that corresponds to the Hartree shift in the BCS limit. With our approximation of the self-energy, the correction to the energy gap with respect to the mean-field result however remains small, in contrast with experimental measurements.
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