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Measuring the Hydrodynamic Linear Response of a Unitary Fermi Gas

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arxiv 1906.11179 v2 pith:YBBYI3KM submitted 2019-06-26 cond-mat.quant-gas

Lorin Baird , Xin Wang , Stetson Roof , J. E. Thomas This is my paper · ORCID
classification cond-mat.quant-gas
keywords fermihydrodynamiclinearpotentialresponseunitaryadiabaticarising
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We directly observe the hydrodynamic linear response of a unitary Fermi gas confined in a box potential and subject to a spatially periodic optical potential that is translated into the cloud at speeds ranging from subsonic to supersonic. We show that the time-dependent change of the density profile is sensitive to the thermal conductivity, which controls the relaxation rate of the temperature gradients and hence the responses arising from adiabatic and isothermal compression.

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  1. Universal Sound Diffusion in a Strongly Interacting Fermi Gas

    cond-mat.quant-gas 2019-09 accept novelty 7.0 of 10

    In a homogeneous unitary Fermi gas, the sound diffusivity falls with temperature and saturates at about hbar/m, independent of temperature below the superfluid transition.

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