Nonlocal hydrodynamic transport and collective excitations in Dirac fluids

  title={Nonlocal hydrodynamic transport and collective excitations in Dirac fluids},
  author={Egor I. Kiselev and Joerg Schmalian},
  journal={Physical Review B},
We study the response of a Dirac fluid to electric fields and thermal gradients at finite wave-numbers and frequencies in the hydrodynamic regime. We find that non-local transport in the hydrodynamic regime is governed by infinite set of kinetic modes that describe non-collinear scattering events in different angular harmonic channels. The scattering rates of these modes $\tau_{m}^{-1}$ increase as $\|m\|$, where $m$ labels the angular harmonics. In an earlier publication, we pointed out that… 
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