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河北省自然科学基金(A2007000233)

作品数:2 被引量:1H指数:1
相关作者:刘力哲李海涛杜坚刘建军更多>>
相关机构:承德民族师范高等专科学校河北师范大学更多>>
发文基金:河北省自然科学基金国家自然科学基金更多>>
相关领域:理学更多>>

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磁场对耦合双量子盘中类氢杂质性质的影响被引量:1
2008年
在有效质量近似下,采用简单的变分波函数,定量计算了无限深对称GaAs/AlGaAs耦合双量子盘在沿轴向不同强度磁场的作用下,类氢杂质体系的基态束缚能随量子盘的半径、中心垒厚、盘厚度的变化.发现,体系束缚能由空间限制作用和磁场限制作用共同决定:在空间限制比较弱时磁场强度对束缚能的影响变得更加明显,当空间限制强时磁场对束缚能的影响变得微弱.还发现,由于2个量子盘间的耦合作用使耦合双量子盘的结果比单量子盘结果偏小.在耦合双量子阱的极限条件下所得的结果与前人的结果符合得很好.
杜坚李海涛刘力哲刘建军
关键词:类氢杂质束缚能磁场
Impurity-related electronic properties in quantum dots under electric and magnetic fields
2011年
This paper presents a systematic study of the ground-state binding energies of a hydrogenic impurity in quantura dots subjected to external electric and magnetic fields. The quantum dot is modeled by superposing a lateral parabolic potential, a Gaussian potential and the energies are calculated via the finite-difference method within the effectivemass approximation. The variation of the binding energy with the lateral confinement, external field, position of the impurity, and quantum-size is studied in detail. All these factors lead to complicated binding energies of the donor, and the following results are found: (1) the binding energies of the donor increase with the increasing magnetic strength and lateral confinement, and reduce with the increasing electric strength and the dot size; (2) there is a maximum value of the binding energies as the impurity placed in different positions along the z direction; (3) the electric field destroys the symmetric behaviour of the donor binding energies as the position of the impurity.
张红翟利学王学张春元刘建军
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