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Creators/Authors contains: "Struck, Julian"

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  1. ; ; ; ; ; (, Physical Review Letters)
  2. ; ; ; ; ; (, Physical Review Letters)
  3. ; ; ; ; ; ; (, Physical Review Letters)
  4. ; ; ; ; ; (, Science)
    Transport of strongly interacting fermions is crucial for the properties of modern materials, nuclear fission, the merging of neutron stars, and the expansion of the early Universe. Here, we observe a universal quantum limit of diffusivity in a homogeneous, strongly interacting atomic Fermi gas by studying sound propagation and its attenuation through the coupled transport of momentum and heat. In the normal state, the sound diffusivity D monotonically decreases upon lowering the temperature, in contrast to the diverging behavior of weakly interacting Fermi liquids. Below the superfluid transition temperature, D attains a universal value set by the ratio of Planck’s constant and the particle mass. Our findings inform theories of fermion transport, with relevance for hydrodynamic flow of electrons, neutrons, and quarks. 
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