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Giant Nonlocality near the Dirac Point in Graphene

By D. A. Abanin, S. V. Morozov, L. A. Ponomarenko, R. V. Gorbachev, A. S. Mayorov, M. I. Katsnelson, K. Watanabe, T. Taniguchi, K. S. Novoselov, L. S. Levitov and A. K. Geim

Abstract

Transport measurements have been a powerful tool for uncovering new electronic phenomena in graphene. We report nonlocal measurements performed in the Hall bar geometry with voltage probes far away from the classical path of charge flow. We observe a large nonlocal response near the Dirac point in fields as low as 0.1T, which persists up to room temperature. The nonlocality is consistent with the long-range flavor currents induced by lifting of spin/valley degeneracy. The effect is expected to contribute strongly to all magnetotransport phenomena near the neutrality point

Topics: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Year: 2011
DOI identifier: 10.1126/science.1199595
OAI identifier: oai:arXiv.org:1104.2268
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