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arXiv 1609.04149cond-mat.str-elcond-mat.mes-hall
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SrTiO3中关联电子液体输运系数的二分法

Dichotomy of the transport coefficients of correlated electron liquids in SrTiO3

Tyler A. Cain, Evgeny Mikheev, Clayton A. Jackson, Susanne Stemmer

摘要:

讨论了窄SrTiO 3量子阱中电子的Seebeck系数和Hall迁移率随三维载流子密度和温度的变化关系。量子阱中的片状载流子密度固定在约7 × 10^14 cm^-2,其厚度是可变的。在高温下,这两种性质都表现出明显的费米液体行为。特别是,当声子阻力贡献最小时,塞贝克系数几乎随温度(T)线性增加,而迁移率则与T^2成正比地降低。此外,塞贝克系数与费米能成反比(减小量子阱厚度)。相反,输运散射率与费米能量无关,这与费米液体不一致。在低温下,塞贝克系数偏离线性温度依赖性的电子液体,表现出相关诱导的赝能隙,表明散射率的能量依赖性的变化。强相关材料中描述运输的影响进行了讨论。

英文摘要:

We discuss the Seebeck coefficient and the Hall mobility of electrons confined in narrow SrTiO3 quantum wells as a function of the three-dimensional carrier density and temperature. The quantum wells contain a fixed sheet carrier density of ~ 7x10^14 cm^-2 and their thickness is varied. At high temperatures, both properties exhibit apparent Fermi liquid behavior. In particular, the Seebeck coefficient increases nearly linearly with temperature (T) when phonon drag contributions are minimized, while the mobility decreases proportional to T^2. Furthermore, the Seebeck coefficient scales inversely with the Fermi energy (decreasing quantum well thickness). In contrast, the transport scattering rate is independent of the Fermi energy, which is inconsistent with a Fermi liquid. At low temperatures, the Seebeck coefficient deviates from the linear temperature dependence for those electron liquids that exhibit a correlation-induced pseudogap, indicating a change in the energy dependence of the scattering rate. The implications for describing transport in strongly correlated materials are discussed.

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