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복잡계 이론물리 연구단
복잡계 이론물리 연구단
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Spin and charge thermopower effects in the ferromagnetic graphene junction

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Title
Spin and charge thermopower effects in the ferromagnetic graphene junction
Author(s)
Javad Vahedi; Fattaneh Barimani
Publication Date
2016-08
Journal
JOURNAL OF APPLIED PHYSICS, v.120, no.8, pp.084303 -
Publisher
AMER INST PHYSICS
Abstract
Using wave function matching approach and employing the Landauer-Buttiker formula, a ferromagnetic graphene junction with temperature gradient across the system is studied. We calculate the thermally induced charge and spin current as well as the thermoelectric voltage (Seebeck effect) in the linear and nonlinear regimes. Our calculation revealed that due to the electron-hole symmetry, the charge Seebeck coefficient is, for an undoped magnetic graphene, an odd function of chemical potential while the spin Seebeck coefficient is an even function regardless of the temperature gradient and junction length. We have also found with an accurate tuning external parameter, namely, the exchange filed and gate voltage, the temperature gradient across the junction drives a pure spin current without accompanying the charge current. Another important characteristic of thermoelectric transport, thermally induced current in the nonlinear regime, is examined. It would be our main finding that with increasing thermal gradient applied to the junction the spin and charge thermovoltages decrease and even become zero for non zero temperature bias. Published by AIP Publishing.
URI
https://pr.ibs.re.kr/handle/8788114/2756
ISSN
0021-8979
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Files in This Item:
2016-08-24 (복잡계이론물리) 1.4961093.pdfDownload

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