二维Hubbard模型光电导谱的研究  

OPTICAL CONDUCTIVITY OF THE TWO-DIMENSIONAL HUBBARD MODEL

作　　者：陈锋[1] 应和平[1] 李文铸[1] 

机构地区：[1]浙江大学物理系

出　　处：《低温物理学报》1995年第4期313-317,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金

摘　　要：我们用巨正则量子蒙特卡洛和最大熵方法研究了二维正方格点上Ｈｕｂｂａｒｄ模型的光电导谱．在半满条件下，光电导谱呈现一能隙区．掺杂后，光电导谱在ω＝０处出现Ｄｒｕｄｅ峰，在能隙区出现一新峰，同时谱权重从高频区向能隙区转移．这些特征与高温氧化物超导体的光电导实验相符合．Abstract Using the combination of the quantum Monte Carlo and the maximum entropy methods,we studied the optical conductivity of the two-dimensional Hubbard model. At half filling, arenergy gap is observed in the spectra. Up on doping, a Drude peak appears at the end of thlOw freqency region, a new peak is presented in the gap region, and' the spectra Weight i!transfered from the high frequency region into the gap region. These characters are in good a'greement with experimental results of high temperature superconductors.

关 键 词：二维模型 超导体 氧化物超导体 光电导谱 

分 类 号：O511.1[理学—低温物理]