周期磁场调制下的二维电子结构  

Two-dimensional Electronic Structure in a Periodic Magnetic Field

作　　者：牟舜禹 张小伟[1] 代波[1] 

机构地区：[1]四川省非金属复合与功能材料重点实验室省部共建国家重点实验室培育基地西南科技大学,四川绵阳621010

出　　处：《计算物理》2014年第2期237-242,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11074206);博士启动基金(09zx7118)资助项目

摘　　要：基于有限差分方法,研究周期梯度磁场调制下二维电子气的电子性质.结果表明:由于周期梯度磁场的存在,体系展现出丰富的电子能带结构.其子带的宽度随|k y|增大而不断变窄,|k y|越大势阱越深;由于在k y>0和k y<0两个区域的有效势能不一样,其能带结构在两个区域不一致且在k y>0的区域中形成更多束缚态.通过改变磁条周期、磁条到2DEG的距离及磁化强度研究其对电子能带结构的影响.With finite-differences approach, we investigate electronic properties of 2DEG in periodic magnetic field modulation. It shows that the system exhibits rich band structures with presence of magnetic field. Width of sub-bands becomes narrower as ky increases, because the greater ky is the deeper the potential well is. Due to different effective potential in two regions, k 〉 0 and ky 〈 0, band structure in two areas are not consistent. More bound states are in the area of ky 〉 0. In addition, we study effect on energy band structure of period, distance of magnetic stripes and strength of magnetization.

关 键 词：二维电子气 周期磁场 电子结构 有限差分 

分 类 号：O427.1[理学—声学]