Department of Physics and Astronomy, West Virginia University , Morgantown, West Virginia 26506, United States.
Physique Théorique des Matériaux, Université de Liège , B-4000 Sart-Tilman, Belgium.
Nano Lett. 2016 Apr 13;16(4):2739-43. doi: 10.1021/acs.nanolett.6b00421. Epub 2016 Mar 7.
We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO3/SrTiO3 interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.
我们报告了在 LaAlO3/SrTiO3 界面处由氧表面吸附物诱导的金属-绝缘体转变。观察到的效应归因于表面 Al 位的终止和由此产生的电子受主表面态。通过控制局部氧吸附，我们成功地演示了界面二维电子气（2DEG）的非破坏性图案化。获得的 2DEG 结构在空气中稳定，并且对一般溶剂处理也具有很强的鲁棒性。本研究为复杂氧化物界面处的金属-绝缘体转变机制提供了新的见解，并为调整界面性能提供了一种高效的技术。
