Impurity scattering and Mott's formula in graphene
Artikel i vetenskaplig tidskrift, 2007

We present calculations of the thermal and electric linear response in graphene, including disorder in the self-consistent t-matrix approximation. For strong impurity scattering, near the unitary limit, the formation of a band of impurity states near the Fermi level leads to that Mott’s relation holds at low temperature. For higher temperatures, there are strong deviations due to the linear density of states. The low-temperature thermopower is proportional to the inverse of the impurity potential and the inverse of the impurity density. Information about impurity scattering in graphene can be extracted from the thermopower, either measured directly or extracted via Mott’s relation from the electron-density dependence of the electric conductivity.

impurity states

carbon

thermoelectric power

impurity scattering

Fermi level

electronic density of states

Författare

Tomas Löfwander

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Mikael Fogelström

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 76 193401-

Ämneskategorier

Fysik

DOI

10.1103/PhysRevB.76.193401