t-J模型中的超导长程序(英文)  

SUPERCONDUCTING LONG-RANGE ORDER IN THE t-J MODEL

作　　者：苏刚[1] 

机构地区：[1]中国科学院研究生院物理教学部,北京100039

出　　处：《中国科学院研究生院学报》2000年第2期22-27,共6页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：ThisworkissupportedinpartbytheNSFC (199470 0 2 ) ;theClimbingPlanProjectofChina;theStateKeyProject forFundamentalResearch

摘　　要：严格证明了在任何非零温度下一维和二维窄带 (包括次近邻跳跃等 )t J模型不会呈现出S波最近邻配对、推广的 η配对、广义的离位Q配对和dx2 - y2 波配对的超导长程序 .如果在系统的电荷激发谱中存在一个激发能隙 ,则这些配对长程序在零温下也会被排除掉 .我们的结果对任意的J值和任意电子填充都成立 .It is shown that the one and the two dimensional t J model with narrow bands (including next nearest neighbor hopping,etc.) does not exhibit s wave nearest neighbor,an extended η,the general off site Q and the d x 2-y 2 wave pairing long range orders at any nonzero temperature. These pairing long range orders will also be excluded at zero temperature if an excited energy gap opens in the charge excitation spectrum of the system. Our results hold true for arbitrary values of J and for any electron fillings.

关 键 词：D波 超导长程序 T-J模型 S波 配对 高温超导 

分 类 号：O511[理学—低温物理]