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arXiv · 1305.0327

Observation of non-sinusoidal current-phase relation in graphene Josephson junctions

Christopher English·David Hamilton·Cesar Chialvo·Ion Moraru·Nadya Mason·Dale Van Harlingen
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Abstract

We present direct measurements of the current-phase relation for lateral Josephson junctions with a graphene barrier, obtained by a phase-sensitive SQUID interferometry technique. We find that the current-phase relation is forward skewed with respect to the commonly observed sinusoidal behavior for short junctions in the quasi-ballistic transport regime, consistent with predictions for the behavior of Dirac fermions in a Josephson junction. The skewness increases with critical current and decreases sharply with increasing temperature.

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Christopher English, David Hamilton, Cesar Chialvo, Ion Moraru, Nadya Mason, Dale Van Harlingen. 2013-05-02. Observation of non-sinusoidal current-phase relation in graphene Josephson junctions. https://arxiv.org/abs/1305.0327

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