Title

Quantum corrections to thermopower and conductivity in graphene

Authors

Authors

A. P. Hinz; S. Kettemann;E. R. Mucciolo

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

CONDUCTANCE FLUCTUATIONS; DISORDERED-SYSTEMS; WEAK-LOCALIZATION; CARBON; NANOTUBES; 2 DIMENSIONS; SCATTERING; TRANSPORT; Physics, Condensed Matter

Abstract

The quantum corrections to the conductivity and thermopower in monolayer graphene are studied. We use the recursive Green's-function method to calculate numerically the conductivity and thermopower of graphene. We then analyze these weak-localization corrections by fitting with the analytical theory as a function of the impurity parameters and gate potential. As a result of the quantum corrections to the thermopower, we find large magnetothermopower, which is shown to provide a very sensitive measure of the size and strength of the impurities. We compare these analytical and numerical results with existing experimental measurements of magnetoconductance of single-layer graphene and find that the average size and strength of the impurities in these samples can thereby be determined. We suggest favorable parameter ranges for future measurements of the magnetothermopower.

Journal Title

Physical Review B

Volume

89

Issue/Number

7

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

21

WOS Identifier

WOS:000332382800004

ISSN

1098-0121

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