摘要

At first glance, the stability of polar faces of ionic crystals seems a mystery. Because their layers are alternately made up of oppositely charged ions, a net dipole moment accumulates along the crystal’s c axis so in principle, the electrostatic energy of a macroscopic crystal bounded by polar surfaces should diverge proportionally as the sample thickness. Nonetheless, a number of stable ionic polar faces occur in nature. Among these, the Zn-terminated (0001) and O-terminated (000-1) faces of ZnO have received widespread attention because these surfaces are active in catalytic and corrosion reactions. In this talk, I shall explain the competing forces acting to stabilize the polar surfaces of ZnO. 

报告人简介

徐虎，分别于2005年和2010年在山东大学和中国科学院获得学士和博士学位，先后在德国不来梅大学和香港城市大学从事研究工作。于2011年8月入职南方科技大学物理系，担任副教授。主要从事半导体极性面结构，金属氧化物表面反应及催化机理研究。