Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations

作者：Slavko Rebec, Tao Jia, Hafiz M. Sohail, Makoto Hashimoto, Dong-Hui Lu, Zhi‐Xun Shen, R. G. Moore · 发表于：Proceedings of the National Academy of Sciences · 年份：2019 · DOI：10.1073/pnas.1821937116 · 被引用次数：18 · 研究领域：Electronic and Structural Properties of Oxides、Ferroelectric and Piezoelectric Materials、Magnetic and transport properties of perovskites and related materials

Significance Titanates are a group of oxide materials which are heavily studied due to their wide array of interesting physical properties. Here, we study the origin of one particular property, the 2-dimensional electron gas (2DEG), by growing SrTiO 3 and other titanate films with different surface terminations, using atomic layer-by-layer growth and probing their electronic structures. Surprisingly, we only observe the 2DEG on the A-site termination and not on the B-site termination. We use this dichotomy to help understand the origin of the 2DEG and suggest how this same methodology could be applied to other oxide systems.