Observation of nonsinusoidal current-phase relation in graphene Josephson junctions

C. D. English, D. R. Hamilton, C. Chialvo, I. C. Moraru, N. Mason, D. J. Van Harlingen

Research output: Contribution to journalArticle

Abstract

The current-phase relation of a Josephson junction can reveal valuable information about the processes influencing the supercurrent. In this paper we present direct measurements of the current-phase relation for Josephson junctions having 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 quasiballistic 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.

Original languageEnglish (US)
Article number115435
JournalPhysical Review B
Volume94
Issue number11
DOIs
StatePublished - Sep 27 2016

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Graphite
Fermions
Critical currents
SQUIDs
Interferometry
Josephson junctions
Graphene
graphene
skewness
Temperature
critical current
interferometry
fermions
predictions
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Observation of nonsinusoidal current-phase relation in graphene Josephson junctions. / English, C. D.; Hamilton, D. R.; Chialvo, C.; Moraru, I. C.; Mason, N.; Van Harlingen, D. J.

In: Physical Review B, Vol. 94, No. 11, 115435, 27.09.2016.

Research output: Contribution to journalArticle

English, C. D. ; Hamilton, D. R. ; Chialvo, C. ; Moraru, I. C. ; Mason, N. ; Van Harlingen, D. J. / Observation of nonsinusoidal current-phase relation in graphene Josephson junctions. In: Physical Review B. 2016 ; Vol. 94, No. 11.
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