Theory of thermopower in two-dimensional graphene
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Motivated by recent experiments by Yuri M. Zuev et al. [Phys. Rev. Lett. 102, 096807 (2009)], Peng Wei et al. [Phys. Rev. Lett. 102, 166808 (2009)], and Joseph G. Checkelsky et al. [Phys. Rev. B 80, 081413(R) (2009)], we calculate the thermopower of graphene incorporating the energy dependence of various transport scattering times. We find that scattering by screened charged impurities gives a reasonable explanation for the measured thermopower. The calculated thermopower behaves as $1/\sqrt{n}$ at high densities, but saturates at low densities. We also find that the thermopower scales with the normalized temperature $T/{T}_{F}$ and does not depend on the impurity densities, but strongly depends on the fine-structure constant ${r}_{s}$ and on the location of the impurities. We discuss the deviation from the Mott formula in graphene thermopower and use an effective-medium theory to calculate thermopower at low carrier density regimes where electron-hole puddles dominate.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/d8f6e303a65038d3892fa1c3ece44f26e9bc0830
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Electronic transport in two-dimensional graphene (2010, methodology): “In Hwang et al. (2009) the same approach was used to calculate the thermopower of SLG with results in good agreement with experiments (Checkelsky et al., 2009; Wei et al., 2009; Zuev et al., 2009).”