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Effects of Magnetic Field on the Valence Bond Property of the Double—Quantum—Dot Molecule 总被引:1,自引:0,他引:1 下载免费PDF全文
The effects of the magnetic field on the valence bond property of the double-quantum-dot molecule are numerically studied by the finite element method and perturbation approach because of the absence of cylindrical symmetry in the horizontally coupled dots.The calculation results show that the energy value of the ground state changes differently from that of the first excited state with increasing magnetic field strength,and they cross under a certain magnetic field.The increasing magnetic field makes the covalent bond state change into an ionic bond state,which agrees qualitatively with experimental results and and makes ionic bond states remain.The oscillator strength of transition between covalent bond states decreases distinctly with the increasing magnetic field strength,when the molecule is irradiated by polarized light.Such a phenomenon is possibly useful for actual applications. 相似文献
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金融学视角的研究使用市场变量代表投资者情绪,未能触及情绪本质.从心理学视角出发,使用行为金融实验方法,研究股票投资者的真实情绪对收益率及后续决策风险偏好的影响.结果发现:1)股价单边下跌时,产生适度消极情绪的个体收益最高.2)对于后续盈利情境的决策,前期产生积极情绪的个体倾向于规避风险,产生消极情绪的个体倾向于寻求风险;对于后续亏损情境的决策,个体均表现为寻求风险.3)股价单边上涨或下跌时,个体最容易出现的具体情绪分别是"倍受鼓舞"、"内疚"等. 相似文献
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We study the dynamics of two interacting electrons in a coupled-quantum-dot system with a time-dependent external electric field. The numerical results of the two-particle states reveal that the dynamical localization still exists under appropriate dc and ac voltage amplitudes. Such localization is different from the stationary localization phenomenon. Our conclusion is instructive for the field of quantum function devices. 相似文献
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利用两点Hubbard模型和Floquet定理,研究了交变电场驱动下耦合双量子点中激子的动力学行为.计算结果表明,系统准能级随交变电场振幅的变化出现一系列严格交叉和回避交叉.在最低的两个准能级的第一个严格交叉点处,初始局域状态一般能够保持,并且随着点内的电子空穴之间库仑相互作用的增强,动态局域化的程度会提高.在最低的两个准能级的第二和第三个严格交叉点处,随着交变电场的增强,这种动态局域化被破坏.在偏离准能严格交叉点和回避交叉点,则不能存在动态局域化现象.
关键词:
Floquet态
准能
局域态 相似文献
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Effects of Electric Field on the Valence—Bond Property of an Electron in a Quantum—Dot Molecule 总被引:2,自引:0,他引:2 下载免费PDF全文
The electronic structure of the quantum-dot molecules in an electric field is investigated by the finite element method with the effective mass approximation.The numerical calculation results show that the valence bond of the quantum-dot molecule alternates between covalent bonds and ionic bonds as the electric field increases.The valence-bond property can be reflected by the oscillator strength of the intraband transition.The bound state with the highest energy level in the quantum-dot molecule gradually changes into a quasibound state when the electric field increases. 相似文献
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