Giant Nonlocality Near the Dirac Point in Graphene
Giant Nonlocality Near the Dirac Point in Graphene
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DOI：
10.1126/science.1199595
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发表时间：
2011-04-15
期刊：
影响因子：
56.9
通讯作者：
Geim, A. K.
中科院分区：
文献类型：
--
作者：
Abanin, D. A.;Morozov, S. V.;Geim, A. K.
输运测量已成为发现石墨烯中电子现象的有力工具。我们报告了在霍尔条几何结构中使用远离电荷流经典路径的电压探针进行的非局部测量。我们在低至 0.1 特斯拉的场中观察到狄拉克点附近存在较大的非局部响应，该响应一直持续到室温。非局域性与自旋/谷简并性提升引起的长程风味电流一致。预计该效应将对中性点附近的所有磁输运现象产生强烈影响。
Transport measurements have been a powerful tool for discovering 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 observed a large nonlocal response near the Dirac point in fields as low as 0.1 tesla, which persisted up to room temperature. The nonlocality is consistent with the long-range flavor currents induced by the lifting of spin/valley degeneracy. The effect is expected to contribute strongly to all magnetotransport phenomena near the neutrality point.