强关联电子相变氧化物材料及多场调控  

Research on the electronic phase transitions in strongly correlated oxides and multi-field regulation

作　　者：周轩弛 李海帆 Zhou Xuan-Chi;Li Hai-Fan(Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education,School of Chemistry and Materials Science,Shanxi Normal University,Taiyuan 030031,China;Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology,Research Institute of Materials Science,Shanxi Normal University,Taiyuan 030031,China;Department of Chemistry,City University of Hong Kong,Hong Kong 999077,China)

机构地区：[1]山西师范大学化学与材料科学学院,磁性分子与磁信息材料教育部重点实验室,太原030031 [2]山西师范大学材料科学研究院,先进永磁材料与技术省部共建协同创新中心,太原030031 [3]香港城市大学化学系,中国香港999077

出　　处：《物理学报》2024年第11期24-36,共13页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12174237,52171183)资助的课题。

摘　　要：外场激励通过调控强关联氧化物中自由度间的关联耦合作用,触发其发生多重莫特电子相变和轨道重构,在强关联电子相变氧化物体系中发现了丰富的新奇物性和量子转变,为构筑新型类脑神经元逻辑器件、磁电耦合器件及能量转换器件奠定基础,引起了凝聚态物理领域的广泛关注.本工作系统地回顾了国内外科研团队在强关联氧化物电子相变特性多场调控领域的研究进展,旨在凸显离子、应力场和栅极电场等新型功能调控自由度在强关联氧化物电子相变特性调控和新型功能特性设计中的关键作用,阐明强关联氧化物中微观自由度的关联耦合作用对其宏观关联电子相变特性的基础调控规律,为实现强关联氧化物电子相变特性的可控设计与精准调控提供理论依据,期望利用多物理场的调控作用在强关联电子相变氧化物材料体系中发现更多的新物理、新物性、新器件和新应用.External-field-triggered multiple electronic phase transitions within correlated oxides open up a new paradigm to explore exotic physical functionalities and new quantum transitions via regulating the electron correlations and the interplay in the degrees of freedom,which makes the multidisciplinary fields have the promising application prospects,such as neuromorphic computing,magnetoelectric coupling,smart windows,bio-sensing,and energy conversion.This review presents a comprehensive picture of regulating the electronic phase transitions for correlated oxides via multi-field covering the VO2 and ReNiO3,thus highlighting the critical role of external field in exploring the exotic physical property and designing new quantum states.Beyond conventional semiconductors,the complex interplay in the charge,lattice,orbital and spin degrees of freedom within correlated oxides triggers abundant correlated physical functionalities that are rather susceptible to the external field.For example,hydrogen-related electron-doping Mottronics makes it possible to discover new electronic phase and magnetic ground states in the hydrogen-related phase diagram of correlated oxides.In addition,filling-controlled Mottronics by using hydrogenation triggers multiple orbital reconfigurations for correlated oxides away from the correlated electronic ground state that results in new quantum transitions via directly manipulating the d-orbital configuration and occupation,such as unconventional Ni-based superconductivity.The transition metals of correlated oxides are generally substituted by dopants to effectively adjust the electronic phase transitions via introducing the carrier doping and/or lattice strain.Imparting an interfacial strain to correlated oxides introduces an additional freedom to manipulate the electronic phase transition via distorting the lattice framework,owing to the interplay between charge and lattice degrees of freedom.In recent years,the polarization field associated with BiFeO3 or PMN-PT material triggered by a cross-p

关 键 词：强关联氧化物 电子相变 关联物性调控 金属-绝缘体转变 

分 类 号：G63[文化科学—教育学]