The thermopower and Nernst Effect in graphene in a magnetic field

Abstract

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.

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

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• Two Dimensional Atomic Crystals
• Landau Level Splitting in Graphene in High Magnetic Fields
• Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene
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• The zero-energy state in graphene in a high magnetic field
• Dissipative Quantum Hall Effect in Graphene near the Dirac Point
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