Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, UK.
Science. 2011 Apr 15;332(6027):328-30. doi: 10.1126/science.1199595.
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.
输运测量一直是发现石墨烯中电子现象的有力工具。我们报告了在 Hall 条形几何结构中进行的非局域测量，其中电压探针远离电荷流动的经典路径。我们在低至 0.1 特斯拉的磁场中，在狄拉克点附近观察到了一个很大的非局域响应，该响应一直持续到室温。这种非局域性与由自旋/谷简并解除引起的长程味流一致。预计该效应将强烈影响中性点附近的所有磁输运现象。
