Giant Nonlocality near the Dirac Point in Graphene

Details Giant Nonlocality near the Dirac Point in Graphene Giant Nonlocality near the Dirac Point in Graphene

2011-04-12

arxiv.org/abs/1104.2268v1

Science 332, 328-330 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1126/science.1199595

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.

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