Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3641424
Keywords
carrier density; carrier mobility; epitaxial layers; graphene; quantum Hall effect; thermoelectric power; thermomagnetic effects
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Funding
- NSF [DMR-0820382]
- W. M. Keck Foundation
- NSFC [11074007]
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The thermoelectric response of high mobility (similar to 20 000 cm(2)/V s at 4 K) single layer epitaxial graphene on silicon carbide substrates has been experimentally investigated. The temperature dependence of the thermopower displays a strong deviation from the Mott relation at a carrier density of 1 x 10(12) cm(-2), reflecting the importance of the screening effect. In the quantum Hall regime, the amplitude of the thermopower peaks is lower than a quantum value, despite the high mobility of the sample. In addition, a temperature dependence for the amplitude is observed, unexpected by theories. The Nernst signal changes it sign as the magnetic field increases. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3641424]
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