轨道选择性相变*--多轨道物理中一类独特的现象

张宇钟

doi:10.7693/wl20140503

同济大学物理科学与工程学院上海市特殊人工微结构材料与技术重点实验室上海 200092

通讯作者: 张宇钟

Orbital selective phase transitions--a unique phenomenon in multi-orbital systems

Corresponding author: ZHANG Yu-Zhong

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。

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Abstract: 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.

轨道选择性相变*--多轨道物理中一类独特的现象

通讯作者: 张宇钟

同济大学物理科学与工程学院上海市特殊人工微结构材料与技术重点实验室上海 200092

关键词:

Orbital selective phase transitions--a unique phenomenon in multi-orbital systems

Corresponding author: ZHANG Yu-Zhong

同济大学物理科学与工程学院上海市特殊人工微结构材料与技术重点实验室上海 200092

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