In a typical metal, charge is transported by particles that move through the sample like non-interacting billiard balls, traveling as effectively free particles until colliding with an impurity or lattice excitation. This gas-like flow of electrons has successfully described nearly all metals discovered to date. Recently however, a new class of conductors---known as strange metals---has been found that breaks this old paradigm. In 2015 we showed that graphene, at the charge neutrality point, can form a new type of strange metal---a Dirac fluid. This relativistic plasma of strongly interacting electron-hole pairs results in a liquid-like flow described by the relativistic Navier-Stokes equations in a disordered medium and can be thought of as the quantum analog of water.
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