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We show that in anisotropic Fermi liquids where momentum-conservingscattering is much faster than momentum-relaxing scattering processes, localimaging of the electric current flow patterns can cleanly distinguish betweenballistic, viscous and ohmic flow patterns simultaneously (using a singleimage). We propose using multi-layer graphene-based heterostructures, includingABA trilayer graphene, as a natural experimental platform where an anisotropicballistic-to-viscous crossover may be visible in near-term experiments. Suchexperiments could lead to more direct measurements of momentum-conservingscattering lengths in electronic Fermi liquids.

Distinguishing viscous, ballistic, and diffusive current flows in anisotropic metals