Mapping band alignment across complex oxide heterointerfaces.
In this study, direct observation of the evolution of electronic structures across complex oxide interfaces has been revealed in the LaAlO(3)/SrTiO(3) model system using cross-sectional scanning tunneling microscopy and spectroscopy. The conduction and valence band structures across the LaAlO(3)/SrTiO(3) interface are spatially resolved at the atomic level by measuring the local density of states. This study directly maps out the electronic reconstructions and a built-in electric field in the polar LaAlO(3) layer. Results also clearly reveal the band bending and the notched band structure in the SrTiO(3) adjacent to the interface.
Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
Bo-Chao
BC
Huang
Ya-Ping
YP
Chiu
Po-Cheng
PC
Huang
Wen-Ching
WC
Wang
Vu Thanh
VT
Tra
Jan-Chi
JC
Yang
Qing
Q
He
Jiunn-Yuan
JY
Lin
Chia-Seng
CS
Chang
Ying-Hao
YH
Chu