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- Publisher
- Springer Journals
- Copyright
- Copyright © 2006 by Nature Publishing Group
- Subject
- Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
- ISSN
- 0028-0836
- eISSN
- 1476-4687
- DOI
- 10.1038/nature05555
- Publisher site
- See Article on Publisher Site
Abstract
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.
Journal
Nature – Springer Journals
Published: Mar 1, 2007