Thermoelectric figure of merit in a quantum wire coupled to a graphene sheet between ferromagnetic leads
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- 作者：Benhu Zhou ; Benliang Zhou ; Yangsu Zeng ; Aihua Zeng…
- 关键词：Mesoscopic and Nanoscale Systems
- 刊名：The European Physical Journal B - Condensed Matter
- 出版年：2014
- 出版时间：April 2014
- 年：2014
- 卷：87
- 期：4
- 全文大小：423 KB
- 参考文献：1. G.S. Nolas, J. Sharp, J. Goldsmid, / Thermoelectrics: Basic Principles and New Materials Developments (Springer, New York, 2001)
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- 刊物主题：Physics
Condensed Matter
Physics
Complexity
Fluids
Solid State Physics and Spectroscopy
Superconductivity, Superfluidity and Quantum Fluids - 出版者：Springer Berlin / Heidelberg
- ISSN：1434-6036
文摘
We theoretically investigate the figure of merit ZT for a quantum wire side-coupled by a graphene sheet and sandwiched between two ferromagnetic electrodes with noncollinear magnetic moments. By using the nonequilibrium Green’s function combining with the tight-binding Hamiltonian, we demonstrate that the ZT for the system develops an oscillating behavior and weakly depends on the wire-graphene coupling strength as well as magnetic configuration of the leads. On the contrary, it is strongly dependent on temperature and the polarization strength of the leads. Importantly, the maximum value of ZT for the system without the polarization strength (p = 0) is about 1.1 at temperature k B T = 0.015Γ 0, which is in agreement with the experimental measurements for silicon nanowires.