Nearly Perfect Fluidity in a High Temperature Superconductor

Abstract

Perfect fluids are characterized as having the smallest ratio of shear viscosity to entropy density, η/s, consistent with quantum uncertainty and causality. So far, nearly perfect fluids have only been observed in the Quark-Gluon Plasma (QGP) and in unitary atomic Fermi gases (UFG), exotic systems that are amongst the hottest and coldest objects in the known universe, respectively. We use Angle Resolve Photoemission Spectroscopy (ARPES) to measure the temperature dependence of an electronic analogue of η/s in an optimally doped cuprate high temperature superconductor, finding it too is a nearly perfect fluid around, and above, its superconducting transition temperature Tc.

Article in press with Phys. Rev. B 22 pages, 9 Figures, 41 References

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Cited by in corpus (12)

• Planckian dissipation, minimal viscosity and the transport in cuprate strange metals
• Relativistic Fluid Dynamics In and Out of Equilibrium -- Ten Years of Progress in Theory and Numerical Simulations of Nuclear Collisions
• Bounds on charge and heat diffusivities in momentum dissipating holography
• Non-hydrodynamic transport in trapped unitary Fermi gases
• Shear viscosity at the Ising-nematic quantum critical point in two dimensional metals
• Lattice Boltzmann simulations of a two-dimensional Fermi gas at unitarity
• Electrical conductivity in the Hubbard model: orbital effects of magnetic field
• Shear viscosity of strongly interacting fermionic quantum fluids
• Demystifying the Holographic Mystique
• Higher-Harmonic Collective Modes in a Trapped Gas from Second-Order Hydrodynamics
• Shear viscosity and imperfect fluidity in bosonic and fermionic superfluids
• Kovtun-Son-Starinets Conjecture and Effects of Mass Imbalance in the Normal State of an Ultracold Fermi Gas in the BCS-BEC Crossover Region