热电相阻效应理论

H. Fukuyama, M. Ogata
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引用次数: 0

摘要

李、赖斯和安德森在他们不朽的论文中,证明了在佩尔斯状态下一维不相称电荷密度波(CDW)中描述电子密度和声子耦合运动的集体模式的存在。这种模式代表了电子的相干滑动运动和晶格畸变,并影响了低能输运性质,由Peierls凝聚物的复序参数相描述,导致纯系统中的Frohlich超导。然而,一旦空间无序存在,相位被固定,系统就会转变为绝缘基态:这是一个戏剧性的变化。由于相子可以被认为是声子拖阻效应的一个极限,所以它对热电的影响是很有意义的,本文基于Kubo和Luttinger的线性响应理论研究了它对热电的影响。结果表明,在低温下,塞贝克系数的绝对值与电阻率的平方根成正比,k_B T/\Delta <<1 (\Delta: Peierls gap),其符号与没有Peierls gap时的电子贡献相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theory of phason drag effect on thermoelectricity
Lee, Rice and Anderson, in their monumental paper, have proved the existence of a collective mode describing the coupled motion of electron density and phonons in one-dimensional incommensurate charge density wave (CDW) in the Peierls state. This mode, which represents the coherent sliding motion of electrons and lattice distortions and affects low energy transport properties, is described by the phase of the complex order parameter of the Peierls condensate, leading to Frohlich superconductivity in pure systems. Once spatial disorder is present, however, phason is pinned and system is transformed into an insulating ground state: a dramatic change. Since phason can be considered as an ultimate of phonon drag effect, it is of interest to see its effects on thermoelectricity, which has been studied in the present paper based linear response theory of Kubo and Luttinger. The result indicates that a large absolute value of Seebeck coefficient proportional to the square root of resistivity is expected at low temperatures k_B T/\Delta <<1 (\Delta: Peierls gap) with opposite sign to the electronic contributions in the absence of Peierls gap.
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