The thermopower and Nernst Effect in graphene in a magnetic field

Details The thermopower and Nernst Effect in graphene in a magnetic field The thermopower and Nernst Effect in graphene in a magnetic field

2008-12-15

arxiv.org/abs/0812.2866v2

Phys. Rev. B 80, 081413(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. In new version, the sign of the Nernst signal is corrected. Text revised and expanded. 2 Figures amended.

Scientific paper

10.1103/PhysRevB.80.081413

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 $n\ne 0$ are in quantitative agreement with the edge-current model of Girvin and Jonson (GJ). The inferred off-diagonal thermoelectric conductivity $\alpha_{yx}$ comes close to the quantum of Amps per Kelvin. At the Dirac point ($n=0$), however, the width of the peak in $\alpha_{yx}$ is very narrow. We discuss features of the thermoelectric response at the Dirac point including the enhanced Nernst signal.

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