CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Thermoelectric-transport in metal/graphene/metal hetero-structure |
Hu Hao(胡昊)a), Cai Jin-Ming(蔡金明)a), Zhang Chen-Dong(张晨栋) a), Gao Min(高敏)a), Pan Yi(潘毅)a), Du Shi-Xuan(杜世萱)a), Sun Qing-Feng(孙庆丰)a), Niu Qian(牛谦) b), Xie Xin-Cheng(谢心澄)a)c), and Gao Hong-Jun(高鸿钧)a)† |
a Beijing National Laboratory of Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b Department of Physics, University of Texas at Austin, USA; c Department of Physics, Oklahoma State University, Stillwater,Oklahoma 74078, USA |
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Abstract We investigate the thermoelectric-transport properties of metal/graphene/metal hetero-structure. We use a single band tight-binding model to present the two-dimensional electronic band structure of graphene. Using the Landauer--Butticker formula and taking the coupling between graphene and the two electrodes into account, we can calculate the thermoelectric potential and current versus temperature. It is found that in spite of metal electrodes, the carrier type of graphene determines the electron motion direction driven by the difference in temperature between the two electrodes, while for n type graphene, the electrons move along the thermal gradient, and for p type graphene, the electrons move against the thermal gradient.
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Received: 19 August 2009
Revised: 27 October 2009
Accepted manuscript online:
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PACS:
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73.40.Rw
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(Metal-insulator-metal structures)
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72.20.Pa
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(Thermoelectric and thermomagnetic effects)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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73.21.-b
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(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
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71.15.Ap
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(Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~60621061), and the National
Basic Research Program of China (Grant Nos.~2006CB921305 and
2009CB929103). |
Cite this article:
Hu Hao(胡昊), Cai Jin-Ming(蔡金明), Zhang Chen-Dong(张晨栋), Gao Min(高敏), Pan Yi(潘毅), Du Shi-Xuan(杜世萱), Sun Qing-Feng(孙庆丰), Niu Qian(牛谦), Xie Xin-Cheng(谢心澄), and Gao Hong-Jun(高鸿钧) Thermoelectric-transport in metal/graphene/metal hetero-structure 2010 Chin. Phys. B 19 037202
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