论文标题
SNO $ _2 $（110）表面的可调二维电子系统
Tunable two-dimensional electron system at the (110) surface of SnO$_2$
论文作者
论文摘要
我们报告了透明散装绝缘子SNO $ _2 $的二维电子系统（2DE）的观察，以及通过温度或欧盟沉积的可调性。 2DE对表面重建不敏感，而且令人惊讶的是，即使暴露于环境条件后，它也可以生存 - 这是一个非凡的事实，回想起众所周知的催化特性SNO $ _2 $。我们的数据表明，表面氧空位是此类2DE的起源，提供了有关SNO $ _2 $的$ n $ type电导率长期启动的关键信息，并提供了广泛的应用。此外，我们的研究表明，给定氧化物中2DE的出现取决于其晶体结构与其传导带的轨道特征之间的微妙相互作用。
We report the observation of a two-dimensional electron system (2DES) at the $(110)$ surface of the transparent bulk insulator SnO$_2$, and the tunability of its carrier density by means of temperature or Eu deposition. The 2DES is insensitive to surface reconstructions and, surprisingly, it survives even after exposure to ambient conditions --an extraordinary fact recalling the well known catalytic properties SnO$_2$. Our data show that surface oxygen vacancies are at the origin of such 2DES, providing key information about the long-debated origin of $n$-type conductivity in SnO$_2$, at the basis of a wide range of applications. Furthermore, our study shows that the emergence of a 2DES in a given oxide depends on a delicate interplay between its crystal structure and the orbital character of its conduction band.
