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Hydrodynamic description of transport in strongly correlated electron systems
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abstract
We develop a hydrodynamic description of the resistivity and magnetoresistance of an electron liquid in a smooth disorder potential. This approach is valid when the electron-electron scattering length is sufficiently short. In a broad range of temperatures, the dissipation is dominated by heat fluxes in the electron fluid, and the resistivity is inversely proportional to the thermal conductivity, $\kappa$. This is in striking contrast with the Stokes flow, in which the resistance is independent of $\kappa$ and proportional to the fluid viscosity. We also identify a new hydrodynamic mechanism of spin magnetoresistance.
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Sign of viscous magnetoresistance in electron fluids
Bulk viscous electron flow has positive magnetoresistance for arbitrary inhomogeneity in one-dimensional periodic models and in weakly inhomogeneous ballistic-to-hydrodynamic crossover calculations, unlike narrow channels.
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