Universal Thermoelectric Effect of Dirac Fermions in Graphene

Details Universal Thermoelectric Effect of Dirac Fermions in Graphene Universal Thermoelectric Effect of Dirac Fermions in Graphene

2009-08-30

arxiv.org/abs/0908.4302v2

Phys. Rev. Lett. 104, 076804 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, published version

Scientific paper

10.1103/PhysRevLett.104.076804

We numerically study the thermoelectric transports of Dirac fermions in graphene in the presence of a strong magnetic field and disorder. We find that the thermoelectric transport coefficients demonstrate universal behavior depending on the ratio between the temperature and the width of the disorder-broadened Landau levels(LLs). The transverse thermoelectric conductivity $\alpha_{xy}$ reaches a universal quantum value at the center of each LL in the high temperature regime, and it has a linear temperature dependence at low temperatures. The calculated Nernst signal has a peak at the central LL with heights of the order of $k_B/e$, and changes sign near other LLs, while the thermopower has an opposite behavior, in good agreement with experimental data. The validity of the generalized Mott relation between the thermoelectric and electrical transport coefficients is verified in a wide range of temperatures.

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