计算物理 ›› 2014, Vol. 31 ›› Issue (2): 237-242.

• 论文 • 上一篇    下一篇

周期磁场调制下的二维电子结构

牟舜禹, 张小伟, 代波   

  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
  • 收稿日期:2013-05-30 修回日期:2013-10-01 出版日期:2014-03-25 发布日期:2014-03-25
  • 通讯作者: 张小伟,E-mail:xiaoweizhang@swust.edu.cn
  • 作者简介:牟舜禹(1988-)男,在读研究生,E-mail:757819601@qq.com
  • 基金资助:
    国家自然科学基金(11074206);博士启动基金(09zx7118)资助项目

Two-dimensional Electronic Structure in a Periodic Magnetic Field

MOU Shunyu, ZHANG Xiaowei, DAI Bo   

  1. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China
  • Received:2013-05-30 Revised:2013-10-01 Online:2014-03-25 Published:2014-03-25

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|ky|增大而不断变窄,|ky|越大势阱越深;由于在ky > 0和ky < 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ky > 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.

关键词: 二维电子气, 周期磁场, 电子结构, 有限差分

Abstract: 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,ky > 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.

Key words: dimensional electrons gas, periodic magnetic field, electronic structure, finite-differences method

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