Origin of Metallic States at Heterointerface between Band Insulators LaAlO$_3$ and SrTiO$_3$

Details Origin of Metallic States at Heterointerface between Band Insulators LaAlO$_3$ and SrTiO$_3$ Origin of Metallic States at Heterointerface between Band Insulators LaAlO$_3$ and SrTiO$_3$

2008-05-21

arxiv.org/abs/0805.3223v1

Phys. Rev. Lett. 101, 026802 (2008)

Physics

Condensed Matter

Materials Science

20 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.026802

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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