Bipolar supercurrent in graphene

Hubert B. Heersche (), Pablo Jarillo-Herrero (), Jeroen B. Oostinga, Lieven M. K. Vandersypen and Alberto F. Morpurgo
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Hubert B. Heersche: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands
Pablo Jarillo-Herrero: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands
Jeroen B. Oostinga: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands
Lieven M. K. Vandersypen: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands
Alberto F. Morpurgo: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands

Nature, 2007, vol. 446, issue 7131, 56-59

Abstract: Graphene's supercurrent Graphene has become a model system in condensed matter physics because its charge-carrying particles move at relativistic speeds, in effect behaving as if they are massless. This leads to some peculiar electron transport properties, like the one described in this issue. In a graphene layer sandwiched between two superconducting electrodes, a superconducting current flows at low temperatures. Current is carried either by electrons or by holes, depending on the gate voltage and hence charge density in the graphene layer. Interestingly, a finite supercurrent can flow even when the charge density is zero. These observations shed light on the relativistic phenomenon known as time-reversal symmetry, and on the nature of transport mechanisms in graphene.

Date: 2007
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DOI: 10.1038/nature05555

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