Dynamic formation of quasicondensate and spontaneous vortices in a strongly interacting Fermi gas

Abstract

We report an experimental study of quench dynamics across the superfluid transition temperature $T_c$ in a strongly interacting Fermi gas by ramping down the trapping potential. The nonzero quasi-condensate number $N_0$ at temperature significantly above $T_c$ in the unitary and the BEC regimes reveals the pseudogap physics. Below $T_c$, a rapid growth of $N_0$ is accompanied by spontaneous generation of tens of vortices. We observe a power law scaling of the vortex density versus the quasi-condensate formation time, consistent with the Kibble-Zurek theory. Our work provides an example of studying emerged many-body physics by quench dynamics and paves the way for studying the quantum turbulence in a strongly interacting Fermi gas.

References in corpus (26)

• Many-Body Physics with Ultracold Gases
• Feshbach Resonances in Ultracold Gases
• The pseudogap in high-temperature superconductors: an experimental survey
• Theory of ultracold Fermi gases
• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• BCS-BEC Crossover: From High Temperature Superconductors to Ultracold Superfluids
• Spontaneous vortices in the formation of Bose-Einstein condensates
• Fermi-Hubbard physics with atoms in an optical lattice
• Introduction to quantum turbulence
• Critical Dynamics of Spontaneous Symmetry Breaking in a Homogeneous Bose gas
• Emergence of coherence in a uniform quasi-two-dimensional Bose gas
• Spontaneous creation of Kibble-Zurek solitons in a Bose-Einstein condensate
• Quench-induced supercurrents in an annular Bose gas
• From high temperature supercondutivity to quantum spin liquid: progress in strong correlation physics
• Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates
• Kibble-Zurek Mechanism in a Spin-1 Bose-Einstein Condensate
• Causality in Condensates: Grey Solitons as Remnants of BEC Formation
• Observation of two-species vortex lattices in a mixture of mass-imbalance Bose and Fermi superfluids
• Kibble-Zurek universality in a strongly interacting Fermi superfluid
• Thermodynamics of Interacting Fermions in Atomic Traps
• Inhomogeneous Kibble-Zurek mechanism: vortex nucleation during Bose-Einstein condensation
• Pseudogaps in strongly interacting Fermi gases
• Creation and counting of defects in a temperature quenched Bose-Einstein Condensate
• Defect Saturation in a Rapidly Quenched Bose Gas
• Pseudogap phenomena in ultracold atomic Fermi gases
• Towards Quantum Turbulence in Cold Atomic Fermionic Superfluids

Cited by in corpus (10)

• Universal Early Coarsening of Quenched Bose Gases
• Probing quantum many-body correlations by universal ramping dynamics
• Quench-induced spontaneous currents in rings of ultracold fermionic atoms
• Proximity effect and spatial Kibble-Zurek mechanism in atomic Fermi gases with inhomogeneous pairing interactions
• Kibble-Zurek scaling of the superfluid-supersolid transition in an elongated dipolar gas
• Nonequilibrium BCS-BEC crossover and unconventional FFLO superfluid in a strongly interacting driven-dissipative Fermi gas
• Out-of-equilibrium dynamics of Bose-Bose mixtures in optical lattices
• CNN-Based Vortex Detection in Atomic 2D Bose Gases in the Presence of a Phononic Background
• Vortex-lattice structures in rotating Bose-Fermi superfluid mixtures
• Structure and scaling of Kitaev chain across a quantum critical point in real space