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arXiv 0908.1358cond-mat.str-el
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LaAlO3/SrTiO3异质结构中产生的多导电载流子

Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

S. S. A. Seo, Z. Marton, W. S. Choi, G. W. J. Hassink, D. H. A. Blank, H. Y. Hwang, T. W. Noh, T. Egami, H. N. Lee

摘要:

我们发现,有一个以上的类型的导电载流子产生的LaAlO 3/SrTiO 3异质结通过比较从光透射光谱和直流传输测量的片状载流子密度和迁移率。当存在多种类型的载流子时,光学表征主要反映了高密度载流子的贡献,而直流传输测量可能会夸大高迁移率载流子的贡献,即使它们以低密度存在。由于在LaAlO 3/SrTiO 3异质结的直流传输所确定的低温迁移率是远远高于那些提取的光学方法,我们归因于低密度的导电载流子的高迁移率传输的起源。

英文摘要:

We have found that there is more than one type of conducting carriers generated in LaAlO3/SrTiO3 heterostructures by comparing the sheet carrier density and mobility from optical transmission spectroscopy with those from dc-transport measurements. When multiple types of carriers exist, optical characterization dominantly reflects the contribution from the high-density carriers whereas dc-transport measurements may exaggerate the contribution of the high-mobility carriers even though they are present at low-density. Since the low-temperature mobilities determined by dc-transport in the LaAlO3/SrTiO3 heterostructures are much higher than those extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.

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