Shock waves in strongly interacting Fermi gas from time-dependent density functional calculations

Abstract

Motivated by a recent experiment [Phys. Rev. Lett. 106, 150401 (2011)] we simulate the collision between two clouds of cold Fermi gas at unitarity conditions by using an extended Thomas-Fermi density functional. At variance with the current interpretation of the experiments, where the role of viscosity is emphasized, we find that a quantitative agreement with the experimental observation of the dynamics of the cloud collisions is obtained within our superfluid effective hydrodynamics approach, where density variations during the collision are controlled by a purely dispersive quantum gradient term. We also suggest different initial conditions where dispersive density ripples can be detected with the available experimental spatial resolution.

5 pages, 4 figures, to be published in Phys. Rev. A

References in corpus (26)

• Theory of ultracold Fermi gases
• Observation of Quantum Shock Waves Created with Ultra Compressed Slow Light Pulses in a Bose-Einstein Condensate
• Dispersive, superfluid-like shock waves in nonlinear optics
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Universal Spin Transport in a Strongly Interacting Fermi Gas
• Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type
• Shocks in nonlocal media
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Formation of Quantum Shock Waves by Merging and Splitting Bose-Einstein Condensates
• Local Density Functional Theory for Superfluid Fermionic Systems: The Unitary Gas
• Vanishing bulk viscosities and conformal invariance of unitary Fermi gas
• Universal properties of a trapped two-component Fermi gas at unitarity
• Superfluid Bose-Fermi mixture from weak-coupling to unitarity
• Observation of shock waves in a strongly interacting Fermi gas
• Extended Thomas-Fermi Density Functional for the Unitary Fermi Gas
• BEC-BCS Crossover of a Trapped Two-Component Fermi Gas with Unequal Masses
• Thermodynamics of a Trapped Unitary Fermi Gas
• Orthogonality catastrophe and shock waves in a non-equilibrium Fermi gas
• DC Josephson Effect with Fermi gases in the Bose-Einstein regime
• Effective Nonlinear Schrödinger Equations for Cigar-Shaped and Disk-Shaped Fermi Superfluids at Unitarity
• Quantum Shock Waves and Domain Walls in the Real-Time Dynamics of a Superfluid Unitary Fermi Gas
• Hydrodynamics of Bose and Fermi superfluids at zero temperature: the superfluid nonlinear Schrodinger equation
• Supersonic and subsonic shock waves in the unitary Fermi gas
• Surface Effects in the Unitary Fermi Gas
• Viscosity-entropy ratio of the unitary Fermi gas from zero-temperature elementary excitations
• Superfluid LDA (SLDA): Local Density Approximation for Systems with Superfluid Correlations

Cited by in corpus (21)

• Quantized Superfluid Vortex Rings in the Unitary Fermi Gas
• Time-Dependent Density Functional Theory and the Real-Time Dynamics of Fermi Superfluids
• Quantum Shock Waves and Population Inversion in Collisions of Ultracold Atomic Clouds
• Validating Simple Dynamical Simulations of the Unitary Fermi Gas
• Fermionic shock waves - dissipative or dispersive?
• Towards Quantum Turbulence in Cold Atomic Fermionic Superfluids
• Dark solitons dynamics and snake instability in superfluid Fermi gases trapped by an anisotropic harmonic potential
• Universal shock-wave propagation in one-dimensional Bose fluids
• Phase-induced transport in atomic gases: from superfluid to Mott insulator
• Collective modes in the anisotropic unitary Fermi gas and the inclusion of a backflow term
• Shock Waves in a Superfluid with Higher-Order Dispersion
• Shock waves in a quasi one-dimensional Bose-Einstein condensate
• Detecting Entrainment in Fermi-Bose Mixtures
• Dynamics of shock waves in a superfluid unitary Fermi gas
• Crow instability in unitary Fermi gas
• Dispersive effects in the unitary Fermi gas
• Critical velocity, vortex shedding and drag in a unitary Fermi superfluid
• Shock waves in colliding Fermi gases at finite temperature
• Correlations and synchronization in a Bose-Fermi mixture
• Study of a degenerate dipolar Fermi gas of 161Dy atoms
• Anisotropic merging and splitting of dipolar Bose-Einstein condensates