Two-dimensional confinement of 3d{1} electrons in LaTiO_{3}/LaAlO{3} multilayers.
نویسندگان
چکیده
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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ورودعنوان ژورنال:
- Physical review letters
دوره 104 3 شماره
صفحات -
تاریخ انتشار 2010