In bilayer graphene, electron-hole collisions give a universal, temperature-independent conductivity at charge neutrality, and a tunable gap collapses the conductivity onto a single curve.
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Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
In bilayer graphene, electron-hole collisions give a universal, temperature-independent conductivity at charge neutrality, and a tunable gap collapses the conductivity onto a single curve.