Enhanced lattice polarization in SrTiO3/LaAlO3 superlattices measured using optical second-harmonic generation
Enhanced lattice polarization in SrTiO3/LaAlO3 superlattices measured using optical second-harmonic generation
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DOI：
10.1103/physrevb.80.081106
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发表时间：
2009-08-01
影响因子：
3.7
通讯作者：
Hwang, H. Y.
中科院分区：
文献类型：
--
作者：
Ogawa, N.;Miyano, K.;Hwang, H. Y.
利用光学二次谐波产生技术研究了SrTiO 3/LaAlO 3界面的晶格极化。采用不同周期的超晶格研究了界面极化的演化，同时分离了衬底的贡献。我们观察到大的垂直光学非线性，它突然增加时，亚晶格厚度超过3个单位电池。极化主要是在SrTiO 3和开发多达8个单位电池从界面。
Lattice polarization at the SrTiO3/LaAlO3 interface was investigated by optical second harmonic generation. Superlattices with varying periodicity were employed to study the evolution of interface polarization, while separating substrate contributions. We observed large perpendicular optical nonlinearity, which abruptly increases when the sublattice thickness goes above 3 unit cells. The polarization is primarily in SrTiO3 and develops up to 8 unit cells from the interface.