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.
出处
《计算物理》
CSCD
北大核心
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
关键词
二维电子气
周期磁场
电子结构
有限差分
2-dimensional electrons gas
periodic magnetic field
electronic structure
finite-differences method
