LaTiO3/LaAlO3多层膜中3d 1电子的二维限制
Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers
摘要：
我们报告的椭圆偏振光谱测量的带间跃迁的各向异性平行和垂直于平面的（LaTiO 3）n（LaAlO 3）5多层膜，n = 1-3。这些提供了关于Ti离子的二维（2D）3d^1态的电子结构的直接信息。结合LDA+U计算，我们认为，二维限制在TiO 2板升降机的t_{2g}状态的简并只留下平面d_xy轨道占用。我们概述了这些多层膜可以作为一个模型系统的研究的t_{2g}二维哈伯德模型。
英文摘要：
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 LDA+U calculations, 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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