Origin of metallic states at the heterointerface between the band insulators LaAlO3 and SrTiO3

K. Yoshimatsu, R. Yasuhara, H. Kumigashira, M. Oshima

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135 Citations (Scopus)

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.

Original languageEnglish
Article number026802
JournalPhysical Review Letters
Volume101
Issue number2
DOIs
Publication statusPublished - 2008 Jul 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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