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.

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

ANCILOTTO, FRANCESCO;SALASNICH, LUCA;TOIGO, FLAVIO
2012

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.
2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2495875
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