二维无序系统无序度和本征能量对局域化长度的影响  

Influence of the disorder and the eigenenergy on localization length in the two-dimensional disordered system

作　　者：冯立峰[1] 姚成宝[1] 张强[1] 

机构地区：[1]哈尔滨师范大学物理与电子工程学院,低维体系与介观物理省重点实验室,黑龙江哈尔滨150025

出　　处：《东北师大学报（自然科学版）》2011年第3期73-75,共3页Journal of Northeast Normal University(Natural Science Edition)

基　　金：黑龙江省自然科学基金资助项目(A200807);黑龙江省教育厅科研项目(11541108)

摘　　要：利用蒙特卡洛模拟方法,研究了无序度和本征能量对局域化长度的影响.研究结果表明:随着无序度的增大,系统的电子态出现局域化现象,局域化长度逐渐减小,而且对应于不同的能量本征值;电子的局域化程度不同,能带中心出现准扩展态,系统内部出现类金属行为.By using Monte Carlo simulation method,the influence of the localization length is studied as a function of the disorder and eigenenergy in disordered system.The results derive that electronic states of system exhibited localization phenomena with the increase of degree of disorder and the localization length can be reduced gradually.Moreover the degree of electronic localization is different for different energy eigenvalue,the quasi extended state appears at the center part of energy band and quasi-metal behavior emerges in the disordered system.

关 键 词：无序系统 ANDERSON模型 局域化 蒙特卡洛模拟 

分 类 号：O469[理学—凝聚态物理]