摘要
金属—绝缘体相变是凝聚态物理中被大量研究并有广泛应用前景的一种物理现象。通常具有巡游性的电子由于受到各种因素(如无序或电子相互作用等)的影响发生局域化,从而形成了金属—绝缘体相变。然而在实际材料中,由于电子还具有轨道属性而使该相变的发生变得更加复杂。文章简要回顾了一类考虑电子轨道自由度后发生的较为特殊的金属—绝缘体相变——轨道选择性相变,即由于电子相互作用的影响而在同一原子壳层中出现局域化的电子和巡游电子共存的现象,并讨论了其形成机理和相关的实验。
The metal-to-insulator transition （MIT） is an extensively studied phenomenon in condensed matter physics, which has wide applications in industry since it is usually accompa- nied by huge resistivity changes. Various factors like disorder or electronic interaction, etc. can lead to localization of itinerant electrons and consequently the MIT. However, in real materials, such a transition becomes complicated because orbital degrees of freedom are involved. In this paper, we review one kind of MIT, named orbital selective phase transition, where orbital degrees of freedom are taken into consideration and localized and itinerant electrons coexist in one atomic shell due to the interactions between electrons. Different mechanisms and related experiments will be discussed.
出处
《物理》
CAS
北大核心
2014年第5期309-318,共10页
Physics
基金
国家自然科学基金(批准号:11174219)
高等学校博士学科点专项科研基金(批准号:20110072110044)
教育部新世纪优秀人才支持计划(批准号:NCET-13-0428)
教育部留学回国人员科研启动基金和上海高等学校特聘教授(东方学者)岗位计划(批准号:沪教委人[2012]53号)资助项目
关键词
金属-绝缘体相变
轨道自由度
电子相互作用
多轨道哈巴德模型
动力学平均场
metal-to-insulator transition, orbital degrees of freedom, electron interactions,multi-orbital Hubbard model, dynamical mean-field theory
