摘要
关联量子材料中电子的巡游性与局域化两种行为的竞争与合作,即莫特物理,是许多量子材料体系多样物态背后的主要物理机制.本文回顾了莫特物理在多种量子材料体系中的体现,论述了其作为量子材料的主旋律之一的各种表现.因此寻找和理解其千变万化的演生方式,是实验凝聚态物理研究的中心任务之一.
The competition and cooperation between the itinerancy behavior and localization behavior of electrons in correlated quantum materials,known as Mott physics,is the physical mechanism behind the diverse states of many quantum materials.This article reviews the manifestation of Mott physics in various quantum materials and establishes it as one of the main themes of quantum materials.Finding and understanding its ever-changing ways of manifestation is one of the central tasks of experimental research on condensed matter physics.Specifically,the filling-control route of Mott transition is illustrated by exampling the surface K-dosed Sr_(2)IrO_(4),which exhibits d-wave gap,pseudogap behavior in underdoped regime,and phase separation with inhomogeneous electronic state distribution.All of these show strong resemblances to the doped cuprate superconductors,another prototypical filling-control type of Mott transition case.On the other hand,the bandwidth-control route of Mott transition could be found in NiS_(2-x)Se_(x),where its bandwidth continuously decreases with decreasing Se concentration,until it becomes an insulator.In addition,the essence of various ways of doping in iron-based superconductors is to change their bandwidths.The superconductivity shows up at intermediate bandwidth with moderate correlations,and it diminishes when the bandwidth is large and the electron correlations are weak.For heavily electron-doped iron-selenides,there is even a Mott insulator phase with strong correlations.For carbon based materials,the phase transition between the antiferromagnetic insulator and superconducting state of A15 Cs_(3)C_(60) as the volume of fullerene anions decreases could be understood in terms of a bandwidth-control Mott transition;the insulator-superconductor transition discovered in electrically gated“magic angle”twisted-angle bilayer graphene could be understood as a filling-control Mott transition.For f electron systems,the interplay between itinerancy and localization dominates the heavy fermion behavio
作者
封东来
Feng Dong-Lai(New Cornerstone Laboratory,National Synchrotron Radiation Laboratory,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230027,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第23期46-55,共10页
Acta Physica Sinica
基金
国家自然科学基金(批准号:11888101)
腾讯新基石基金资助的课题。
关键词
莫特相变
哈伯德模型
近藤晶格
演生现象
Mott transition
Hubbard model
Kondo lattice
emergent phenomena
