本文通过介绍单电子近似的基本思路和所获得的成及其不足，进而讨论电子关联在目前凝聚态物理如超导、魔角石墨烯等前沿问题中的重要意义.在教学中，电子关联效应是体物理基础知识和前沿问题相互连接的纽带，具有承上启下的作用. 因此，在教学中应重视电子关联现象的讲解及在前沿理领域中作用.

the formation of solid electronic theory，and the movement of single electrons in the periodic

potential field develops into energy band theory.One of the important achievements of

energy band theory is the successful prediction of the electrical conductivity of

crystals.However，its interpretation of the properties of transition metal oxides has been

encountered inconsistent results.Mott first pointed out the fundamental reason for this from a

physical point of view: the energy band theory based on the single-electron approximation

and ignores the correlation between electrons. This article aims to introduce the basic ideas

of the single-electron approximation and its achievements and shortcomings，then discusses the

importance of electronic correlation in the current frontier field of condensed matter

physics，such as superconductivity and magic angle graphene.Let students understand that electronic

correlation effect is the link be- tween the basic knowledge of solid physics and the frontier

science.Therefore，the explanation of electronic correla- tion effect and its role in the field of

frontier physics should be emphasized in teaching.