Locally critical resistivities from umklapp scattering.

  title={Locally critical resistivities from umklapp scattering.},
  author={Sean A. Hartnoll and Diego M. Hofman},
  journal={Physical review letters},
  volume={108 24},
Efficient momentum relaxation through umklapp scattering, leading to a power law in temperature dc resistivity, requires a significant low energy spectral weight at finite momentum. One way to achieve this is via a Fermi surface structure, leading to the well-known relaxation rate Γ∼T2. We observe that local criticality, in which energies scale but momenta do not, provides a distinct route to efficient umklapp scattering. We show that umklapp scattering by an ionic lattice in a locally critical… CONTINUE READING

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