Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

Seo, S. S. A.; Marton, Z.; Choi, W. S.; Hassink, G. W. J.; Blank, D. H. A.; Hwang, H. Y.; Noh, T. W.; Egami, T.; Lee, H. N.
August 2009
Applied Physics Letters;8/24/2009, Vol. 95 Issue 8, p082107
Academic Journal
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 mobility determined by dc-transport in the LaAlO3/SrTiO3 heterostructures is much higher than that extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.


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