能谷与非线性光学  

Valley and nonlinear optics

作　　者：吴施伟 

机构地区：[1]复旦大学物理系应用表面物理国家重点实验室微纳光子结构教育部重点实验室,上海200433 [2]南京大学人工微结构科学与技术协同创新中心,南京210093

出　　处：《物理》2016年第8期510-515,共6页Physics

摘　　要：能谷自由度是近年来随着新型二维量子材料的研究而兴起的新焦点,而非线性光学则是现代光学学科中的重要分支。这两个看似没有任何交集的领域由于都对物质材料的中心反演对称破缺极度敏感而密切关联。文章将以过渡金属二硫属化物的单层和少层为代表,介绍能谷自由度与非线性光学中最基本的二次谐波过程之间的关系。由此得出,非线性光学可以成为研究能谷物理的重要技术和手段。同时,过渡金属二硫属化物等能谷材料也大大丰富了非线性光学的研究对象,预期二维材料和器件可以成为非线性光学研究的新机遇和新热点。With the emergence of atomically thin two-dimensional quantum materials in recent years, the valley degree of freedom has become a new research focus. Meanwhile, nonlinear optics is an important and indispensable branch in modern optics. These two seemingly unrelated topics are now intimately correlated by the fact that both are sensitive to the broken inversion symmetry of various materials. In this paper I will introduce the relationship between the valley degree of freedom and the most basic nonlinear optical process, namely second harmonic generation, by focusing on the monolayer and few layers of transition metal dichalcogenides. It will be shown that nonlinear optics is a powerful technique to study valley physics. In turn, valley hosting materials such as transition metal dichalcogenides enrich the subject of nonlinear optics. It is anticipated that two-dimensional materials and devices will emerge as a new frontier of nonlinear optics.

关 键 词：能谷 过渡金属二硫属化物 非线性光学 二次谐波产生 

分 类 号：O437[机械工程—光学工程]