论文标题
法森阻力效应对热电学的理论
Theory of Phason Drag Effect on Thermoelectricity
论文作者
论文摘要
Lee，Rice和Anderson在其纪念性纸中证明了一种集体模式，该模式描述了PEIERLS状态中一维不合格的电荷密度波（CDW）中电子密度和声子的耦合运动。这种模式代表电子和晶格扭曲的连贯的滑动运动并影响低能传输性能，用Peierls冷凝物的复杂阶参数的相描述，从而导致纯系统中的Fröhlich超导性。然而，一旦存在空间障碍，法森就会固定并将系统转化为绝缘的基态：一种巨大的变化。由于Phason可以被认为是声子阻力效应的终极，因此可以看到其对热电性的影响，这已经在基于纸张的Kubo和Luttinger的基于纸的线性响应理论中进行了研究。结果表明，在低温下，塞贝克系数的绝对值与电阻率成正比的k_b t/Δ<< 1（δ：peierls间隙）在没有PEIERLS间隙的情况下与电子贡献相反。
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 Fröhlich 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/Δ<<1 (Δ: Peierls gap) with opposite sign to the electronic contributions in the absence of Peierls gap.
