Two-Dimensional Confinement of 3d(1) Electrons in LaTiO3/LaAlO3 Multilayers
- Authors
- Seo, S. S. A.; Han, M. J.; Hassink, G. W. J.; Choi, W. S.; Moon, S. J.; Kim, J. S.; Susaki, T.; Lee, Y. S.; Yu, J.; Bernhard, C.; Hwang, H. Y.; Rijnders, G.; Blank, D. H. A.; Keimer, B.; Noh, T. W.
- Issue Date
- 22-Jan-2010
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.104, no.3
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 104
- Number
- 3
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/14813
- DOI
- 10.1103/PhysRevLett.104.036401
- ISSN
- 0031-9007
- Abstract
- 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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