journal6 ›› 2007, Vol. 28 ›› Issue (5): 60-64.

• 物理与电子 • 上一篇    下一篇

球形GaAs-Ga1-xAlxAs量子点中激子束缚能的变分法计算

  

  1. (吉首大学物理科学与信息工程学院,湖南 吉首 416000)
  • 出版日期:2007-09-25 发布日期:2012-06-11
  • 作者简介:周秀文(1982-),女,湖南湘阴人,吉首大学物理科学与信息工程学院助教,硕士生,主要从事晶体光学研究.
  • 基金资助:

    湖南省教育厅科学研究项目(05B014)

Calculation of the Binding Energy  of Ecitons in  Spherical GaAs-Ga1-xAlxAsQuantum Dots by Variational Approach

  1. (College of Physics Science and Information Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2007-09-25 Published:2012-06-11

摘要:用无限深势阱和有限深势阱2种模型,计算了激子束缚能与球形量子点半径的关系.计算结果表明:对于无限深势阱模型,量子点中激子束缚能随着量子点的半径增加而减小;对于有限深势阱模型,当量子点半径较小时,束缚能随着量子点的半径增加而增加;当量子点半径增加到一定值时,它的束缚能达到最大值,继续增加量子点半径,束缚能反而减少.这些计算结果对深入理解半导体量子点中激子的物理本质具有一定学术意义.

关键词: 变分法, 量子点, 激子, 束缚能, 波函数

Abstract: The relation between the exciton binding energy and the spherical quantum dot radius  has been calculated using the variational method.Calculations were performed using both the infinite and finite confining potential well model.The results show that the exciton binding energy decreases as the dot radius increases for infinite confining well model.For the finite confining well model,the binding energy reaches a peak value as the dot radius increases and then decreases to a limiting value corresponding to that in the barrier material.These results are important for the study of the physical properties of exciton in quantum dot.

Key words: variational approach, quantum dots, exciton, binding energy, wave function

公众号 电子书橱 超星期刊 手机浏览 在线QQ