Researchonelectronicsystemsincondensedmatterphysicsisatpresentdevelopingveryrapidly,wherethemainfocusischangingfromthe"single-particleproblem"tothe"many-particleproblem".Thatis,themainresearchinterestchangedfromphenomenathatcanbeunderstoodinthesingleparticlepicture,as,forexample,inbandtheory,tophenomenathatariseowingtotheinteractionbetweenmanyelectrons.
![现代晶体学1·晶体学基础：对称性和晶体学方法[俄]B·K伐因斯坦 著；吴自勤、孙霞 译中国科学技](http://img3m0.ddimg.cn/4/2/11888998510-1_l.jpg)
