氢原子斯塔克效应的能级分裂规律

根据简并情况下的微扰理论和n=1,2,3,4能级对应的久期方程的规律,推出任意状态下氢原子斯塔克效应中的久期方程行列式中各矩阵元的分布规律,并找出了氢原子一级斯塔克效应在电场中的能级分裂规律.     

用有效哈密顿方法计算氢原子的斯塔克效应

本文应用有效哈密顿方法，在准确到二级近似的条件下，计算了氢原子第一激发能级在外电场中的分裂，为分析强场下的斯塔克效应提供了一个理论基础。     

氢原子的一级斯塔克效应的能级分裂和简并度

我们以表格的形式给出了氢原子的一级斯塔克效应的能级分裂及简并度的情况,并通过与以往文献中的理论计算比较得到了验证.最后在抛物坐标下,通过对氢原子一级斯塔克效应能级分裂一般表达式的分析,给出了相邻两条能级间距满足1.5neεa的理论支持.     

电子-狄喇克双子束缚态的宇称性质及其斯塔克效应

讨论了电子—狄喇克双子束缚态解的宇称性质,指出:当q≠0(即磁荷存在)时,解的宇称确定性遭到破坏,因此破坏宇称守恒的△j=0的跃迁是允许的。从而产生了不同于通常类氢原子的线性斯塔克效应。还计算了该系统的斯塔克效应的能级分裂,指出了它不同于类氢原子的诸多特点。 关键词：     

CdS/HgS/CdS球状纳米系统高能级斯塔克线度效应

研究了在层间作用和电场作用下球状纳米系统的电子能量和波函数.以CdS/HgS/CdS球状纳米系统为例,讨论了层间作用、电场和样品线度对高能级斯塔克效应以及谱线频率和强度的影响.结果表明：CdS/HgS/CdS球状纳米系统在外电场作用下发生斯塔克效应的能级分裂规律与氢原子类似,但能级位移量不同.谱线频移与电场强度的平方成正比,多数谱线的频移随线度增大而减小,少数谱线的频移则相反;而层间作用引起谱线的频移随线度增大而减小.除少数谱线外,多数谱线的相对强度随线度增大而减小,层间作用不会改变相对强度随线度的变化趋 关键词： CdS/HgS/CdS球状纳米系统 斯塔克效应 谱线频率 谱线强度     

球状纳米系统高能级斯塔克效应和谱

以三层CdS/HgS/CdS球状纳米系统为例,研究了在电场和层间作用下球状纳米系统高能级斯塔克效应的能级分裂规律以及谱线的频率、强度和自发幅射系数的线度效应. 结果表明,系统的斯塔克效应在只有电场时,能级是按1,3,…,(2n—1)的规律进行分裂,与氢原子类似;有电场和层间同时作用时,能级是按1,4,…,n²的规律进行分裂. 量子跃迁时各谱线的频率均随系统线度增大而减小,除少数谱线外,多数谱线的强度随线度增大而减小,而自发幅射系数随线度增大而增大;电场会引起谱线的频率发生改变,其谱线频移量与电场强度的平方成正比;除少数谱线外,电场和层间作用引起的谱线频移量均随线度增大而减小;层间作用会使电子的能级稍有降低,稍微增大谱线的强度和自发幅射系数值,但它不会影响谱线的频率、强度和自发幅射系数随线度的变化趋势,在线度较小时层间作用的影响才显著.     

一维氢原子的斯塔克效应

用定态微扰理论计算了一维氢原子在均匀外电场中的斯塔克效应,并给出了一级、二级能级修正的普遍公式。     

氢原子斯塔克效应中微扰矩阵元的普遍公式

讨论了任意能级下氢原子斯塔克效应中的微扰矩阵元，并给出了n=4能级的能量一级修正值。     

二维氢原子的斯塔克效应

本文用微扰理论计算了二维氢原子在均匀外电场中的斯塔克（Ｓｔａｒｋ）效应，并从对称性的角度讨论了能级简并被解除的原因。     

钠原子能级的斯塔克结构

本文报道钠在主量子数n=12,13,14附近能区的斯塔克(stark)效应,外场从0～8kV/cm.观察到随着电场的增加,角动量小的项并入线性斯塔克簇,且不同|m|的能级简并解除.对实验结果进行了分析讨论.     

The optical Stark effect in semiconductor quantum wires

A new approach for controlling the optical emission wavelength of semiconductor quantum wires is proposed. The wavelength control resides upon the effect of an intense, long-wavelength laser field radiation applied to the semiconductor structure. Under such condition a strong optical Stark effect leads to optical tunability. Calculation of the optical Stark effect was carried out in the frame of the nonperturbative theory and finite difference method. Different geometries concerning the size of GaAs–AlGaAs quantum wires as well as the polarization direction and the strength of the applied laser field with respect to the quantum structure were considered.     

Stark效应对量子纠缠信息交换传递的影响

用多个“二能级原子与单模光场”组成的联合物理模型,考虑Stark效应后,推导了该系统的态矢演化式,得到光场纠缠度的数值计算结果.讨论了Stark效应和初始场强对量子纠缠信息交换传递的影响.结果发现,在一定条件下,原子纠缠态与光场纠缠态之间可以转化,实现了量子纠缠信息的交换传递,且Stark效应和初始场强对此过程有着显著的影响:光场的纠缠程度随着初始场强的增强而增大;在强场条件下,光场纠缠度出现崩塌-回复现象.Stark移位参量越大,光场纠缠度振荡越剧烈,说明Stark效应破坏了光场纠缠程度的稳定性.     

原子与单模场相互作用中克尔效应与斯塔克效应的统一处理

处理了包含克尔效应和斯塔克效应的原子与场相互作用模型。由于在其有效哈密顿中作了旋转波近似，两种效应的影响可以归结为对原子与场失谐的改变，这种失谐变化依赖于一个系统的守恒量。研究表明，克尔效应和斯塔克效应在一定条件下是等价的。研究了当场的初态为宏观可区分量子迭加态时，光子的反聚束效应。探讨了在广义的克尔介质中原子与场相互作用模型的求解。     

Propagation of vector solitons in a quasi-resonant medium with stark deformation of quantum states

The nonlinear dynamics of a vector two-component optical pulse propagating in quasi-resonance conditions in a medium of nonsymmetric quantum objects is investigated for Stark splitting of quantum energy levels by an external electric field. We consider the case when the ordinary component of the optical pulse induces ?? transitions, while the extraordinary component induces the ?? transition and shifts the frequencies of the allowed transitions due to the dynamic Stark effect. It is found that under Zakharov-Benney resonance conditions, the propagation of the optical pulse is accompanied by generation of an electromagnetic pulse in the terahertz band and is described by the vector generalization of the nonlinear Yajima-Oikawa system. It is shown that this system (as well as its formal generalization with an arbitrary number of optical components) is integrable by the inverse scattering transformation method. The corresponding Darboux transformations are found for obtaining multisoliton solutions. The influence of transverse effects on the propagation of vector solitons is investigated. The conditions under which transverse dynamics leads to self-focusing (defocusing) of solitons are determined.     

Quantum crystallites and nonlinear optics

This is a review and analysis of the optical properties of quantum crystallites, with principal emphasis on the electro-optic Stark effect and all optical third order nonlinearity. There are also introductory discussions on physical size regimes, crystallite synthesis, quantum confinement theory, and linear optical properties. The experiments describe CdSe crystallites, exhibiting strong confinement of electrons and holes, and CuCl crystallites, exhibiting weak confinement of the exciton center of mass. In the CdSe system, neither the Stark effect nor the third order nonlinearity is well understood. The Stark shifts appear to be smaller than calculated, and field inducted broadening also occurs. The third order nonlinearity is only modestly stronger than in bulk material, despite theoretical prediction. Unexpectedly large homogeneous widths, due to surface carrier trapping, in the nominally discrete crystallite excited states appear to be involved. The CuCl system shows far narrower spectroscopic homogeneous widths, and corresponds more closely to an ideal quantum dot in the weak confinement limit. CuCl also exhibits exciton superradiance at low temperature. Surface chemistry and crystallite encapsulation are critical in achieving the predicted large Stark and third order optical effects in II-VI and III-V crystallites.     

Optical stark effect and dressed exciton states in a Mn-doped CdTe quantum dot

We report on the observation of spin-dependent optically dressed states and the optical Stark effect on an individual Mn spin in a semiconductor quantum dot. The vacuum-to-exciton or the exciton-to-biexciton transitions in a Mn-doped quantum dot are optically dressed by a strong laser field, and the resulting spectral signature is measured in photoluminescence. We demonstrate that the energy of any spin state of a Mn atom can be independently tuned by using the optical Stark effect induced by a control laser. High resolution spectroscopy reveals a power-, polarization-, and detuning-dependent Autler-Townes splitting of each optical transition of the Mn-doped quantum dot. This experiment demonstrates an optical resonant control of the exciton-Mn system.     

光子统计特性对原子能级AC Stark移动的影响

以相干态单模场和单模热光场引起的原子能级ACStark移动为例,分析了光子统计特性对能级移动规律的影响,能级AC Stark移动中包含了光场统计特性信息,这表明可以通过AC Stark效应研究场的统计性质。     

Controlled optical switching based on dipole-induced transparency in a cavity–waveguide system

We show that one can control the path of an optical field propagating in a waveguide with another optical field in a cavity–waveguide system. The strong coupling between the two optical fields is achieved using cavity–QED based on dipole-induced transparency and an optical Stark shift. Numerical simulations suggest that the optical switching is possible even when the intensity of the control field approaches the single photon level.     

On the binding energies of excitons in polar quantum well structures in a weak electric field

The binding energies of excitons in quantum well structures subjected to an applied uniform electric field by taking into account the exciton longitudinal optical phonon interaction is calculated. The binding energies and corresponding Stark shifts for Ⅲ-Ⅴ and Ⅱ-Ⅵ compound semiconductor quantum well structures have been numerically computed. The results for GaAs/A1GaAs and ZnCdSe/ZnSe quantum wells are given and discussed. Theoretical results show that the exciton-phonon coupling reduces both the exciton binding energies and the Stark shifts by screening the Coulomb interaction. This effect is observable experimentally and cannot be neglected.     

用Ξ形四能级模型研究非对称耦合量子阱非定域激子复合发光

基于Ξ形四能级模型运用密度矩阵方程研究了非对称量子阱中非定域激子复合发光特性.理论结果表明：非定域激子复合发光具有双峰特征，两峰相对于中心跃迁频率的红移和蓝移量与电子和空穴的振荡频率密切相关.与单量子阱相比，这种频率移动对外加电场相当敏感，即当外加反向电场作小的变化时，两峰有较大的移动，表现强量子限域斯塔克效应.这意味着利用非对称量子阱在新一代高速调制器和光开关中具有潜在的应用价值. 关键词： 非对称耦合量子阱 共振隧穿 非定域激子 量子限域斯塔克效应