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

被引：137
|
作者：
Yoshimatsu, K. [1 ]
Yasuhara, R. [1 ]
Kumigashira, H. [1 ,2 ]
Oshima, M. [1 ,2 ]
机构：
[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan
[2] Japan Sci & Technol Agcy, CREST, Bunkyo Ku, Tokyo 1138656, Japan
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 02期
关键词：
D O I：
10.1103/PhysRevLett.101.026802
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have studied the electronic structure at the heterointerface between the band insulators LaAlO(3) and SrTiO(3) using in situ photoemission spectroscopy. Our experimental results clearly reveal the formation of a notched structure on the SrTiO(3) side due to band bending at the metallic LaAlO(3)/TiO(2)-SrTiO(3) interface. The structure, however, is absent at the insulating LaAlO(3)/SrO-SrTiO(3) 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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页数：4
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