SrTiO3/LaAlO3超晶格的非线性光学响应
Nonlinear Optical Response of SrTiO3/LaAlO3 Superlattices
摘要：
SrTiO 3/LaAlO 3界面的电子对称性的光学二次谐波产生的研究，使用不同的周期性的超晶格研究的电子重构的演变，同时避免衬底的贡献。超晶格表现出很大的垂直光学非线性，当亚晶格厚度超过3个晶胞时，垂直光学非线性急剧增加，揭示了极性-非极性界面的重要作用。非线性的“活性”区域主要是在SrTiO 3，随着厚度的增加而发展，并从界面延伸到8个晶胞。
英文摘要：
The electronic symmetry of the SrTiO3/LaAlO3 interface was investigated by optical second harmonic generation, using superlattices with varying periodicity to study the evolution of the electronic reconstruction while avoiding substrate contributions. The superlattices show large perpendicular optical nonlinearity, which abruptly increases when the sublattice thickness goes above 3 unit cells, revealing substantial effects of the polar-nonpolar interface. The nonlinear 'active' area is primarily in SrTiO3, develops with increasing thickness, and extends up to 8 unit cells from the interface.
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