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arXiv 1508.04098cond-mat.mes-hall
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石墨烯中声子拖曳热势的均分机制

Phonon drag thermopower in graphene in equipartition regime

S. V. Koniakhin, E. D. Eidelman

摘要:

这封信计算了电子-声子相互作用对石墨烯热电效应的贡献。考虑独立石墨烯的情况,考虑与固有声学声子的相互作用。所考虑的温度范围从液氮到室内水平。结果表明,声子对电子的拖曳对热电动势的贡献取决于样品中的费米能和声子弛豫时间。显式的温度依赖性的贡献来自声子的热电动势是弱的,相反,由于扩散,这是直接与温度成正比。得到的依赖性表明,在所考虑的温度下,高载流子浓度和样品具有高的热导率,声子阻力的贡献可以成为主导。因此,已经建立了一个理论极限的可能增加的热电动势通过电子阻力的固有声子的石墨烯。

英文摘要:

This letter calculates the contribution of electron-phonon interaction to thermoelectric effects in graphene. One considers the case of free standing graphene taking into account interaction with intrinsic acoustic phonons. The temperatures considered range from liquid nitrogen to the room level. It has turned out that the contribution to thermoelectromotive force due to electron drag by phonons is determined by the Fermi energy in the sample and phonon relaxation time. The explicit temperature dependence of the contribution to thermoelectromotive force deriving from by phonons is weak in contrast to that due to diffusion, which is directly proportional to temperature. The dependence obtained suggests that at the temperatures considered, a high carrier concentration and for samples with a high thermal conductivity, the phonon drag contribution can become dominant. Thus a theoretical limit has been established for a possible increase of the thermoelectromotive force through electron drag by the intrinsic phonons of graphene.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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