Phase diffusion in graphene-based Josephson junctions.
We report on graphene-based Josephson junctions with contacts made from lead. The high transition temperature of this superconductor allows us to observe the supercurrent branch at temperatures up to ∼2 K, at which point we can detect a small, but nonzero, resistance. We attribute this resistance to the phase diffusion mechanism, which has not been yet identified in graphene. By measuring the resistance as a function of temperature and gate voltage, we can further characterize the nature of the electromagnetic environment and dissipation in our samples.
Department of Physics, Duke University, Durham, North Carolina 27708, USA.
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Borzenets
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Coskun
S J
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Jones
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Finkelstein