共查询到15条相似文献,搜索用时 46 毫秒
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采用线性组合算符与变分相结合的方法研究了温度对无限深量子阱中弱耦合束缚极化子性质的影响。推导出在弱耦合情况下,无限深量子阱中束缚极化子的基态能量和振动频率与温度的关系。选择GaAs晶体为例,进行数值计算。结果表明:温度升高时,量子阱中弱耦合束缚极化子的振动频率增大;温度升高、阱宽增大时,量子阱中弱耦合束缚极化子的基态能量的绝对值增大。 相似文献
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采用线性组合算符与变分相结合的方法研究了温度对无限深量子阱中弱耦合束缚极化子性质的影响.推导出在弱耦合情况下,无限深量子阱中束缚极化子的基态能量和振动频率与温度的关系.选择GaAs晶体为例,进行数值计算.结果表明:温度升高时,量子阱中弱耦合束缚极化子的振动频率增大;温度升高、阱宽增大时,量子阱中弱耦合束缚极化子的基态能... 相似文献
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给出了具有椭球边界量子棒经过坐标变换成球形边界的哈密顿量。采用线性组合算符和幺正变换的方法研究了在非均匀抛物限制势下量子棒中弱耦合极化子的振动频率λ﹑第一内部激发态能量E1、激发能量ΔE和从激发态到基态跃迁谱线频率ω随椭球的纵横比e’、电子-声子耦合强度α和横向和纵向有效受限长度lp和lz的变化关系。数值计算结果表明:振动频率、第一内部激发态能量、激发能量和跃迁谱线频率随横向和纵向有效受限长度的减少而迅速增大。第一内部激发态能量随电子-声子耦合强度的增加而减少。振动频率随椭球的纵横比的增加而减少。当e’ >1时,激发能量和跃迁谱线频率随椭球的纵横比的增加而增加。当e’ <1时,随椭球的纵横比的减少而增大。当e’ =1时,它们取极小值。 相似文献
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采用线性组合算符和幺正变换方法,研究磁场对非对称量子点中弱耦合杂质束缚极化子性质的影响。导出了非对称量子点中弱耦合杂质束缚磁极化子振动频率和基态结合能随量子点的横向和纵向受限强度、磁场的回旋共振频率、库仑束缚势和电子-声子耦合强度的变化关系。数值计算结果表明:非对称量子点中弱耦合杂质束缚磁极化子振动频率和基态结合能随量子点的横向和纵向受限强度的增大而迅速增大,表现出奇特的量子尺寸效应。 相似文献
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肖景林 《固体电子学研究与进展》2009,29(1)
采用线性组合算符和幺正变换方法研究库仑场对非对称量子点中强耦合极化子性质的影响。导出了非对称量子点中强耦合束缚极化子的振动频率、基态能量和基态结合能随量子点的横向和纵向有效受限长度,库仑束缚势和电子-声子耦合强度的变化关系。数值计算结果表明:非对称量子点中强耦合束缚极化子的振动频率、基态能量和基态结合能随量子点的横向和纵向有效受限长度的减小而迅速增大,表现出新奇的量子点的量子尺寸效应。基态能量随库仑束缚势和电子-声子耦合强度的增加而减小,振动频率和基态结合能随电子-声子耦合强度和库仑束缚势的增加而增大。 相似文献
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量子阱中强耦合极化子的性质 总被引:4,自引:1,他引:4
采用改进的线性组合算符和变分相结合的方法,导出了量子阱中强耦合极化子的振动频率和有效质量;讨论了阱宽和电子-声子耦合强度对强耦合极化子的有效质量的影响以及极化子的速度对振动频率、基态能量、基态结合能和有效质量的影响。通过数值计算结果表明;强耦合极化子的有效质量随阱宽的增加而减少,随电子声子耦合强度的增加而增大;极化子的振动频率、有效质量和基态结合能随极化子速度的增大而增加,极化于的基态能量随速度的增大而减小。 相似文献
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量子棒中弱耦合极化子的基态能量 总被引:2,自引:0,他引:2
The Hamiltonian of the quantum rod (QR) with an ellipsoidal boundary is given after a coordinate transformation. Using the linear-combination operator and unitary transformation methods, the vibrational frequency and the ground-state energy of weak-coupling polarons are obtained. Numerical results illustrate that the vibrational frequency increases with the decrease of the effective radius R0 of the ellipsoidal parabolic potential and the aspect ratio e of the ellipsoid, and that the ground-state energy increases with the decrease of the effective radius R0 and the electron-LO-phonon coupling strength α. In addition, the ground-state energy decreases with increasing aspect ratio e within 0 〈 e 〈 1 and reaches a minimum when e = 1, and then increases with increasing e for e 〉 1. 相似文献
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应用线性组合算符方法和幺正变换方法,研究在抛物势作用下的柱型量子点中极化子的性质。对Zns、AgBr量子点的数值计算表明:量子点中极化子的基态能量E^o随有效受限ι^o长度zo、柱高L的减小而增加,ι^o或L愈小,增加愈快;当ι^o或L减小到某一值(α=0.649、L=20.0nm;ι^o=7.2nm;或α=0.649、ι^o=20.0nm、L=10.0nm)时,极化子能量将大于零;平均声子数随耦合常数的增加而增加。 相似文献
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The Hamiltonian of a quantum rod with an ellipsoidal boundary is given after a coordinate transformation which changes the ellipsoidal boundary into a spherical one. We then study the first internal excited state energy, the excitation energy and the frequency of the transition spectral line between the first internal excited state and the ground state of the strong-coupling polaron in a quantum rod. The effects of the electron–phonon coupling strength, the aspect ratio of the ellipsoid, the transverse radius of quantum rods and the transverse and longitudinal effective confinement length are taken into consideration by using a linear combination operator and the unitary transformation methods. It is found that the first internal excited state energy, the excitation energy and the frequency of the transition spectral line are increasing functions of the electron–phonon coupling strength, whereas they are decreasing ones of the transverse radius of quantum rods and the aspect ratio. The first internal excited state energy, the excitation energy and the frequency of the transition spectral line increase with decreasing transverse and longitudinal effective confinement length. oindent 相似文献
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The Hamiltonian of a quantum rod with an ellipsoidal boundary is given after a coordinate transformation which changes the ellipsoidal boundary into a spherical one. We then study the first internal excited state energy, the excitation energy and the frequency of the transition spectral line between the first internal excited state and the ground state of the strong-coupling polaron in a quantum rod. The effects of the electron-phonon coupling strength, the aspect ratio of the ellipsoid, the transverse radius of quantum rods and the transverse and longitudinal effective confinement length are taken into consideration by using a linear combination operator and the unitary transformation methods. It is found that the first internal excited state energy, the excitation energy and the frequency of the transition spectral line are increasing functions of the electron-phonon coupling strength, whereas they are decreasing ones of the transverse radius of quantum rods and the aspect ratio. The first internal excited state energy, the excitation energy and the frequency of the transition spectral line increase with decreasing transverse and longitudinal effective confinement length. 相似文献
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采用线性组合算符和幺正变换方法研究了抛物量子点中弱耦合束缚磁极化子的振动频率和基态能量,并对其进行了数值计算。结果表明:束缚极化子的振动频率随有效受限长度的增加而减小,随库仑束缚势和回旋共振频率的增加而增加;束缚磁极化子的基态能量随有效受限长度、电子-体纵光学声子耦合强度、库仑束缚势的增加而减小,随回旋共振频率的增加而增加。 相似文献