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Electron–electron (e–e) collisions can impact transport in a variety of surprising and sometimes counterintuitive ways 1, 2, 3, 4, 5, 6. Despite strong interest, experiments on the subject proved challenging because of the simultaneous presence of different scattering mechanisms that suppress or obscure consequences of e–e scattering 7, 8, 9, 10, 11. Only recently, sufficiently clean electron systems with transport dominated by e–e collisions have become available, showing behaviour characteristic of highly viscous fluids 12, 13, 14. Here we study electron transport through graphene constrictions and show that their conductance below 150 K increases with increasing temperature, in stark contrast to the metallic character of doped graphene 15. Notably, the measured conductance exceeds the maximum conductance possible for free electrons 16, 17. This anomalous behaviour is attributed to collective movement of …
Nature Publishing Group
Publication date: 
1 Dec 2017

R Krishna Kumar, DA Bandurin, FMD Pellegrino, Y Cao, A Principi, Haoyu Guo, GH Auton, M Ben Shalom, Leonid Alexandrovich Ponomarenko, G Falkovich, K Watanabe, T Taniguchi, IV Grigorieva, LS Levitov, M Polini, AK Geim

Biblio References: 
Volume: 13 Issue: 12 Pages: 1182-1185
Nature Physics