期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.036401
关键词
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资金
- National Research Foundation of Korea
- Ministry of Education, Science, and Technology [2009-0080567, R17-2008-033-01000-0]
- Dutch Ministry of Economic Affairs (NanoNed)
- Swiss National Science Foundation [20020-119784]
- German Science Foundation [SFB/TRR 80]
We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n = 1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d(1) state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t(2g) states leaving only the planar d(xy) orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t(2g) 2D Hubbard model.
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