Anomalous Thermoelectric Transport of Dirac Particles in Graphene
Anomalous Thermoelectric Transport of Dirac Particles in Graphene
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DOI：
10.1103/physrevlett.102.166808
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发表时间：
2009-04-24
影响因子：
8.6
通讯作者：
Shi, Jing
中科院分区：
文献类型：
--
作者：
Wei, Peng;Bao, Wenzhong;Shi, Jing
我们报告了石墨烯在零磁场和外加磁场下的热电研究。作为无质量粒子线性色散的直接结果，我们发现塞贝克系数S-xx以1/root发散|n（二维）|其中n（2D）是载流子密度。我们观察到一个非常大的能斯特信号S-xy（类似于50 μ V/K在8 T）在狄拉克点，和振荡的依赖性的S-xx和S-xy的n（2D）在低温下。我们的研究结果强调了石墨烯中的异常热电输运，这可能是一个高灵敏度的探针附近的狄拉克点的杂质带。
We report a thermoelectric study of graphene in both zero and applied magnetic fields. As a direct consequence of the linear dispersion of massless particles, we find that the Seebeck coefficient S-xx diverges with 1/root|n(2D)|, where n(2D) is the carrier density. We observe a very large Nernst signal S-xy (similar to 50 mu V/K at 8 T) at the Dirac point, and an oscillatory dependence of both S-xx and S-xy on n(2D) at low temperatures. Our results underscore the anomalous thermoelectric transport in graphene, which may be used as a highly sensitive probe for impurity bands near the Dirac point.