期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 22, 期 31, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/31/315502
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资金
- National Science Foundation of China
- National Basic Research Program of China [2007CB310402]
- Shanghai Municipal Commission of Science and Technology [06dj14008]
- Program for New Century Excellent Talents in University
Considering electron-impurity and electron-phonon scattering, we present a balance-equation-based theoretical examination of thermoelectric power (TEP) in a two-dimensional single-layer graphene away from the carrier neutrality point. Both the boundary scattering and phonon-phonon interaction in phonon relaxation processes are taken into account. We find that, at temperatures T > 10 K, the contribution to TEP mainly comes from diffusive processes and the phonon-drag effect can be ignored. However, at T less than or similar to 10 K, the phonon-phonon interaction leads to a phonon-drag peak in the temperature dependence of TEP. We also compare our results with experiments.
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