LaAlO3/SrTiO3界面导电性的近场成像

摘要

铝酸镧/钛酸锶(LaALO3/SrTiO3)异质界面被发现具有二维导电性并呈现出其他一些有趣的呈展现象.而此前,LaAlO3/SrTiO3异质界面的导电性主要都是通过电学方法进行表征.这里作者首次提出利用散射式扫描近场光学显微镜(s-SNOM)对LaAlO3/SrTiO3界面的导电性进行空间成像,这为研究过渡金属氧化物异质界面体系的物理现象提供了一个新的手段.%The LaAlO3/SrTiO3 heterointerface has been discovered to show two-dimensional interfacial conductivity and other intriguing emergent phenomena.Its interfacial conductivity was mainly characterized by electric methods previously.Here the authors present for the first time that scattering-type scanning near-field optical microscopy (s-SNOM) can be employed to spatially image the conductivity of the buried LaAlO3/SrTiO3 interface,providing a new means to study the physics of transition metal oxide heterointerface systems.