Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-02-22
Journal of the Korean Physical Society, vol.57, 149 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 5 figures
Scientific paper
We investigated the electrical transport properties of superconductor-graphene-superconductor (SGS) Josephson junctions. In low voltage bias, we observed conventional proximity-coupled Josephson effect, such as the supercurrent flow through the graphene, sub-gap structure of differential conductance due to Andreev reflection, and periodic modulation of the critical current Ic with perpendicular magnetic field H to the graphene. In high bias above the superconducting gap voltage, however, we also observed an anomalous jump of the differential conductance, the voltage position of which is sensitive to the backgate voltage Vg. Our extensive study with varying Vg, temperature, and H reveals that the above-gap structure takes place at a characteristic power P*, which is irrespective of Vg for a given junction. Temperature and H dependences of P* are well explained by the increase of the electron temperature in graphene.
Choi Jae-Hyun
Doh Yong-Joo
Lee Hu-Jong
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