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We have analysed theoretically the polarization and dielectric constant of uniaxial ionic crystals,including the effect of the nonlinear interactions between ions.The spectrum of polaritons(coupling modes of photons and optical phonons) under nonlinear interactions was developed.A new branch of dispersion relations emerges in the original frequency gap. 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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A class of special periodic windows in coupled Logistic lattice and its bifurcation behaviors versus the coupling strength are investigated, The system has long chaotic transient and the average transient length increases exponentially with respect to the system size. 相似文献
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磁场作用下二维Bloch电子,在非极低温情况下,电子Bloch能带的磁致裂隙对电子运动的影响将不重要,这时在准经典近似下分析霍耳漂移速率.通过数值求解,得到不同磁感应强度下波矢空间的稳定唯一周期解或稳定焦点不动解,并通过大量数值计算找出了参数空间中周期解与不动解的参数划分;进一步给出了霍耳漂移速率随磁感应强度变化过程中的突变现象.数值解的性质与Poincaré-Bendixson定理相一致
关键词: 相似文献
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We have carried out a theoretical calculation of the differential cross section for the electron Raman scattering process associated with the surface optical phonon modes in a semiconductor quantum disc.electron states are considered to be confined within a quantum disc with infinite potential barriers.The optical phonon modes we have adopted are the slab phonon modes by taking into consideration the Frohlich interaction between an electron and a phonon.The selection rules for the Raman process are given.Numerical results and a discussion are also presented for various radii and thicknesses of the disc,and different incident radiation energies. 相似文献
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