TL;DR
This paper investigates the dynamics of Fermi gases after a sudden interaction switch-on, revealing that the momentum distribution jump persists smoothly over time without abrupt vanishing or Fermi surface relaxation.
Contribution
It demonstrates that the momentum distribution jump in Fermi gases evolves smoothly and retains its original loci, challenging expectations of abrupt changes or relaxation.
Findings
The momentum distribution jump remains finite over time.
The loci of jumps stay at the noninteracting Fermi sea.
No relaxation of Fermi surface geometry occurs.
Abstract
It is shown that the jump in the momentum distribution of Fermi gases evolves smoothly for small and intermediate times once an interaction between the fermions is suddenly switched on. The jump does not vanish abruptly. The loci in momentum space where the jumps occur are those of the noninteracting Fermi sea. No relaxation of the Fermi surface geometry takes place.
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