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Updated: Jul 2, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
Origin of metallic states at the heterointerface between the band insulators LaAlO3 and SrTiO3
K Yoshimatsu1, R Yasuhara, H Kumigashira
1Department of Applied Chemistry, University of Tokyo, Tokyo 113-8656, Japan.
Abstract:
We have studied the electronic structure at the heterointerface between the band insulators LaAlO3 and SrTiO3 using in situ photoemission spectroscopy. Our experimental results clearly reveal the formation of a notched structure on the SrTiO3 side due to band bending at the metallic LaAlO3/TiO2-SrTiO3 interface. The structure, however, is absent at the insulating LaAlO3/SrO-SrTiO3 interface. The present results indicate that the metallic states originate not from the charge transfer through the interface on a short-range scale but from the accumulation of carriers on a long-range scale.
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