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arXiv 1503.04484cond-mat.str-el
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SrTiO3-based二维电子液体输运寿命的分离

Separation of transport lifetimes in SrTiO3-based two-dimensional electron liquids

Evgeny Mikheev, Christopher R. Freeze, Brandon J. Isaac, Tyler A. Cain, Susanne Stemmer

摘要:

偏离朗道费米液体行为是非常规超导体正常状态的普遍特征。尽管经过几十年的研究,这些性质的基本机制仍然没有完全理解。在这项工作中,我们表明,在SrTiO 3/RTTiO 3(R = Gd或Sm)界面的二维电子液体揭示了惊人的相似的物理。霍尔和电阻率数据的分析表明,运输和霍尔散射率,也被称为“两个寿命”的行为,一个明确的分离。这个框架给出了一个非常简单和一般的描述的霍尔系数的温度依赖性。不同的传输寿命准确地描述了传输现象,无论初始磁有序的性质,无序的程度,禁闭,或出现非费米液体行为。霍尔散射率在临界量子阱厚度处发散,与量子相变一致。总的来说,这些结果引入了新的限制现有的微观理论的寿命分离和点的需要统一的理解。

英文摘要:

Deviations from Landau Fermi liquid behavior are ubiquitous features of the normal state of unconventional superconductors. Despite several decades of investigation, the underlying mechanisms of these properties are still not completely understood. In this work, we show that two-dimensional electron liquids at SrTiO3/RTiO3 (R = Gd or Sm) interfaces reveal strikingly similar physics. Analysis of Hall and resistivity data show a clear separation of transport and Hall scattering rates, also known as "two-lifetime" behavior. This framework gives a remarkably simple and general description of the temperature dependence of the Hall coefficient. Distinct transport lifetimes accurately describe the transport phenomena irrespective of the nature of incipient magnetic ordering, the degree of disorder, confinement, or the emergence of non-Fermi liquid behavior. The Hall scattering rate diverges at a critical quantum well thickness, coinciding with a quantum phase transition. Collectively, these results introduce new constraints on the existing microscopic theories of lifetime separation and point to the need for unified understanding.

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