In super-clean materials, electricity doesn't just buzz around—it flows like a thick, gooey liquid.
arXiv · March 18, 2026 · 2603.15737
The Takeaway
In these materials, electrons bump into each other so frequently that they start to behave collectively, exhibiting whirlpools and waves similar to water. This 'hydrodynamic' flow allows for 'superdiffusion,' where energy moves through the material in ways that defy the standard laws of electrical circuits.
From the abstract
Clean two-dimensional Fermi liquids are now known to exhibit an intermediate tomographic regime, between ballistic and Navier--Stokes transport, caused by the anomalously slow relaxation of parity-odd multipolar deformations of the Fermi surface. Here we show that this anomaly extends to the dynamical realm. Starting from a microscopic numerical evaluation of the linearized electron--electron collision operator, we find that the finite-frequency nonlocal conductivity is controlled at low frequen