Thermopower and Nernst effect in graphene in a magnetic field

被引：243
|
作者：
Checkelsky, Joseph G. [1 ]
Ong, N. P. [1 ]
机构：
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 08期
基金：
美国国家科学基金会;
关键词：
electrical conductivity; graphene; Landau levels; thermoelectric power; thermomagnetic effects;
D O I：
10.1103/PhysRevB.80.081413
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report measurements of the thermopower S and Nernst signal S-yx in graphene in a magnetic field H. Both quantities show strong quantum oscillations vs the gate voltage V-g. Our measurements for Landau levels of index n not equal 0 are in quantitative agreement with the edge-current model of Girvin and Jonson (GJ). The inferred off-diagonal thermoelectric conductivity alpha(xy) is consistent in magnitude with GJ's prediction. At the Dirac point (n=0), however, the width of the peak in alpha(xy) is very narrow. We discuss the physical meaning of the peak width and the puzzle raised by alpha(xy) for states at the Dirac point.
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页数：4
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