Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Physical review letters, 2008-07, Vol.101 (2), p.026802-026802

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

PROLA

Beschreibungen/Notizen

• 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.