期刊
PHYSICAL REVIEW B
卷 88, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.115111
关键词
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资金
- Deutsche Forschungsgemeinschaft [FOR 1162, TRR 80]
- Deutsches Elektronen-Synchrotron (DESY)
- Federal Ministry of Education and Research (BMBF) [05KS7UM1, 05K10UMA, 05KS7WW3, 05K10WW1]
We present a detailed study of the electronic structure and band alignment in LaAlO3/SrTiO3 oxide heterostructures by hard x-ray photoelectron spectroscopy. Our spectroscopic measurements find no evidence for the strong potential gradient within the polar LaAlO3 film predicted by band theory. Due to the high interface sensitivity of the method, we are further able to determine the valence band offset between the LaAlO3 film and the SrTiO3 substrate, which is found to be independent of the number of LAO overlayers. Finally, we discuss several explanations for the apparent absence of the built-in field in ex situ prepared LaAlO3/SrTiO3 heterostructures.
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