Charge and orbital degrees of freedom at interfaces studied with nonlinear optics

在钙钛矿锰氧化物外延薄膜及其界面处发现了大的磁电阻和应变诱导对称性破缺。通过利用磁输运和非线性光学绘制相图，确定了d（x^2-y^2）型轨道阶的临界厚度约为4 nm。在二次谐波显微镜下，详细研究了轨道有序畴的演化，这些畴可以通过光照射进行操纵。

Large magneto-resistance and strain-induced symmetry breaking were fond in the epitaxial thin films and their interfaces of perovskite manganites. By composing a phase diagram by using magneto-transports and nonlinear optics, the critical thickness of the d(x^2-y^2)-type orbital-order was confirmed to be about 4 nm. Under a second-harmonic microscope, the evolution of orbital-ordered domains was studied in detail, and these domains could be manipulated by photoirradiation.