Dynamics of a Fermi gas quenched to unitarity
arXiv:2103.07033 · doi:10.1103/PhysRevLett.127.100405
Abstract
We present an experimental study of a two component Fermi gas following an interaction quench into the superfluid phase. Starting with a weakly attractive gas in the normal phase, interactions are ramped to unitarity at a range of rates and we measure the subsequent dynamics as the gas approaches equilibrium. Both the formation and condensation of fermion pairs are mapped via measurements of the pair momentum distribution and can take place on very different timescales, depending on the adiabaticity of the quench. The contact parameter is seen to respond very quickly to changes in the interaction strength, indicating that short-range correlations, based on the occupation of high-momentum modes, evolve far more rapidly than the correlations in low-momentum modes necessary for pair condensation.
6 pages, 3 figures
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- Nonequilibrium BCS-BEC crossover and unconventional FFLO superfluid in a strongly interacting driven-dissipative Fermi gas
- Dynamic virial theorem at nonequilibrium and applications
- Dimer-projection contact and the clock shift of a unitary Fermi gas
- When does a Fermi puddle become a Fermi sea? Emergence of pairing in two-dimensional trapped mesoscopic Fermi gases
- Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
- Higgs oscillations in a unitary Fermi superfluid
- Emergence of Fermi's Golden Rule in the Probing of a Quantum Many-Body System
- Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems