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题名: Giant Zeeman splitting in manganese-doped ZnSe quantum spheres: Eight-band effective-mass calculations
作者: Zhu, YH (Zhu, Yuan-Hui);  Xia, JB (Xia, Jian-Bai)
发表日期: 2006
摘要: We deduce the eight-band effective-mass Hamiltonian model for a manganese-doped ZnSe quantum sphere in the presence of the magnetic field, including the interaction between the conduction and valence bands, the spin-orbit coupling within the valence bands, the intrinsic spin Zeeman splitting, and the sp-d exchange interaction between the carriers and magnetic ion in the mean-field approximation. The size dependence of the electron and hole energy levels as well as the giant Zeeman splitting energies are studied theoretically. We find that the hole giant Zeeman splitting energies decrease with the increasing radius, smaller than that in the bulk material, and are different for different J(z) states, which are caused by the quantum confinement effect. Because the quantum sphere restrains the excited Landau states and exciton states, in the experiments we can observe directly the Zeeman splitting of basic states. At low magnetic field, the total Zeeman splitting energy increases linearly with the increasing magnetic field and saturates at modest field which is in agreement with recent experimental results. Comparing to the undoped case, the Zeeman splitting energy is 445 times larger which provides us with wide freedom to tailor the electronic structure of DMS nanocrystals for technological applications.
KOS主题词: Diluted magnetic semiconductors
刊名: PHYSICAL REVIEW B
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Zhu, YH (Zhu, Yuan-Hui); Xia, JB (Xia, Jian-Bai) .Giant Zeeman splitting in manganese-doped ZnSe quantum spheres: Eight-band effective-mass calculations ,PHYSICAL REVIEW B,DEC 2006,74 (24):Art.No.245321
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