2021/03/31 by Paul Dyke, P. Dyke, A. Hogan +6
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensation #Condensed matter physics #Cooper pair #Fermi Gamma-ray Space Telescope #Fermi gas #Fermion #Materials science #Momentum (technical analysis) #Phase (matter) #Physics #Quantum many-body systems #Quantum mechanics #Quantum, superfluid, helium dynamics #Range (aeronautics) #Statistical physics #Superconductivity #Superfluidity #Thermodynamics #Unitarity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.127.100405
published as Phys. Rev. Lett. 127, 100405 (2021) · 6 pages, 3 figures
arxiv created 2021/08/07 · openalex publication_date 2021/08/31 · arxiv updated 2021/09/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.