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Quantum-critical conductivity of the Dirac fluid in graphene

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Science  12 Apr 2019:
Vol. 364, Issue 6436, pp. 158-162
DOI: 10.1126/science.aat8687

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Electron hydrodynamics in graphene

Electrons can move through graphene in a manner reminiscent of fluids, if the conditions are right. Two groups studied the nature of this hydrodynamic flow in different regimes (see the Perspective by Lucas). Gallagher et al. measured optical conductivity using a waveguide-based setup, revealing signatures of quantum criticality near the charge neutrality point. Berdyugin et al. focused on electron transport in the presence of a magnetic field and measured a counterintuitive contribution to the Hall response that stems from hydrodynamic flow.

Science, this issue p. 158, p. 162; see also p. 125