Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

Abstract

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.

3 figures, supplemental material

References in corpus (6)

• Magnetic effects at the interface between nonmagnetic oxides
• The role of oxygen vacancies in SrTiO3 at the LaAlO3/SrTiO3 interface
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces
• Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures
• Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices

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