Complete article pdf is available on the arxiv server: https://arxiv.org/abs/2202.02798 https://arxiv.org/abs/2202.02798 Helpful background article "Imaging

Complete article pdf is available on the arxiv server: https://arxiv.org/abs/2202.02798 https://arxiv.org/abs/2202.02798 Helpful background article "Imaging the breakdown of ohmic transport in graphene" (Jenkins et al. 2020) https://arxiv.org/abs/2002.05065 https://arxiv.org/abs/2002.05065 > "Ohm’s law states that the current flow through an electrical conductor is proportional to a voltage difference across it. While this introductory textbook physics is ubiquitous in macroscopic electrical devices, Ohm’s law need not hold locally at every point inside of a conductor. Specifically, Ohm’s law arises only on length scales sufficiently long that microscopic scattering processes completely relax the electrical current. In an ordinary metal, impurity scattering and umklapp processes, each of which relax current, dominate the electronic dynamics; hence Ohm’s law arises on scales larger than the electronic mean free path... In this regime, electrical transport is diffusive. However, in low-density, low-disorder Fermi liquids, it was predicted decades ago that dynamics could be dominated by electron-electron collisions, which conserve momentum... the momentum-conserving collisions do not completely relax the electrical current, resulting in viscous rather than diffusive transport, with current flow resembling that of a fluid." This seems to be more of an improved experimental method than anything else. The 'possible practical applications' claim in the article headline is probably there to draw in investments for startups or to justify the next round of grant applications. This is why it's almost always best to ignore the university media office press releases (which are generally one-sided puffery) and just look at the papers themselves, and perhaps independent science articles. The actual important big-picture result seems to be this: > "More broadly, these techniques provide a powerful method for visualizing electronic dynamics normally invisible in bulk resistivity measurements."