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Thermoelectric effect in a graphene sheet connected to ferromagnetic leads

Authors :
Zongqiao Liu
Benhu Zhou
Guanghui Zhou
Benliang Zhou
Source :
Journal of Applied Physics. 112:073712
Publication Year :
2012
Publisher :
AIP Publishing, 2012.

Abstract

We theoretically investigate the thermoelectric property of a graphene sheet coupled to two ferromagnetic electrodes with noncollinear magnetic moments. By using the nonequilibrium Green's function combining with the tight-binding Hamiltonian, it is demonstrated that the thermopower weakly depends on the polarization strength as well as on magnetic configuration of the leads. On the contrary, the electronic contribution to the thermal conductance is sensitive to both the polarization strength and the relative alignment of magnetization directions. Furthermore, the thermopower shows a linear dependence on temperature and an inverse dependence on the Fermi energy in the graphene, which agrees well the recent experimental measurements.

Details

ISSN :
10897550 and 00218979
Volume :
112
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........1b076a5b36e4620dca7c4636b9ca7141