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arXiv 0910.0741cond-mat.mtrl-scicond-mat.str-elcond-mat.supr-con
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电子在LaAlO3/SrTiO3界面的动力学响应和约束

Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface

A. Dubroka, M. Roessle, K. W. Kim, V. K. Malik, L. Schulz, S. Thiel, C. W. Schneider, J. Mannhart, G. Herranz, O. Copie, M. Bibes, A. Barthelemy, C. Bernhard

摘要:

利用红外椭偏仪和输运测量研究了LaAlO_3和SrTiO_3之间界面的电子。我们得到了面载流子密度为Ns~5- 9 × 10 E13 cm^-2,有效质量为m*~3m_e,迁移率与频率密切相关。后者是类似的散装SrTi 1-xNbxO 3,因此暗示的极化相关的限制载流子。我们还确定了垂直密度分布,它具有强烈的不对称形状,在第一个2 nm的快速初始衰减和延伸到约11 nm的明显的尾部。

英文摘要:

With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier density of Ns~5-9x 10E13 cm^-2, an effective mass of m*~3m_e, and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi1-xNbxO3 and therefore suggestive of polaronic correlations of the confined carriers. We also determined the vertical density profile which has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm.

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