Abstract
We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of multilayers with . These provide direct information about the electronic structure of the two-dimensional (2D) state of the Ti ions. In combination with local density approximation, including a Hubbard calculation, we suggest that 2D confinement in the slabs lifts the degeneracy of the states leaving only the planar orbitals occupied. We outline that these multilayers can serve as a model system for the study of the 2D Hubbard model.
- Received 23 October 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.036401
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