检索结果-南通市图书馆

Binding Energy of an Exciton Bound to Ionized Acceptor in Quantum Dots

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第11期36卷 631-634页

作者： xie Wen-fang Department of Physics Guangzhou UniversityGuangzhou 510405China

Binding energiesfor an exciton (X ) trapped in the two-dimensional quantum dot by a negative ion located on the z axis at a distance from the dot plane are calculated by using the method of few-body *** configuration is called a barrier (A-,X) *** dependence of the binding energy of the ground state of the barrier (A-,X)center on the electron-to-hole mass ratio for a few values of the distance d between the fixed negative ion on the z axis and the dot plane is *** find that when d → 0,the barrier (A-,X) center has not any bound *** also studied the stability and binding energy of the ground state of the barrier (A-,X) center in a parabolic quantum dot as a function of the distance d between the fixed negative ion on the z axis and the dot plane.

关键词： quantum dot,exciton complex,few-body physics

A Negative Donor Center Trapped by a Spherical Quantum Dot

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第2期49卷 507-510页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

The properties of the low-lying states of a negative donor center trapped by a spherical quantum dot, which is subjected to a parabolic potential confinement, are investigated in the absence of magnetic field. The calculations have been performed by means of the exact diagonalization of the Hamiltonian matrix within the effective-mass approximation. We find that there is only one bound state the D^- center in a spherical parabolic quantum dot in the absence of magnetic field. The binding energy of the ground state is obtained as a function of the dot size. Moreover, the critical confined potential radius value at which the negative donor center changes from unbound to bound is obtained.

关键词： quantum dots donor

Trapped Three Interacting Bosons with a Short-Ranged Interaction

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第3X期46卷 538-540页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

A system of three bosons trapped by a parabolic confinement and interacting with a short-ranged interaction has been investigated by the exact diagonafization of the Hamiltonian matrix. We report a calculation for the energy spectrum of the low-lying states of a system of three interacting bosons. The important feature of the low-lying states of three interacting bosons trapped by a parabolic confinement is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum

A Helium Atom Confined by a Spherical Gaussian Potential Well

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第5期49卷 1287-1290页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

The helium atom confined by a non-impenetrable spherical box, i.e., a spherical Gaussian potential well which possesses finite height and range, is studied employing the exact diagonalization method. Total energies of the ground and three low-excited states are obtained as a function of the confined potential radii. We find that the confinement may cause accidental degeneracies between levels with different low-excited states and the inversion of the energy values. The results for the three-dimensional spherical potential well and the two-dimensional disc-like potential well are compared with each other： in general, the energies of the states decrease and the energy intervals between states increase with the reduction of the space dimensions.

关键词： helium atom energy spectrum

Linear and Nonlinear Optical Absorptions of a Hydrogenic Donor in a Quantum Dot Under a Magnetic Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第5期51卷 923-926页

作者： xie Wen-fang School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China

The linear and nonlinear optical properties of a hydrogenic donor in a disc-like parabolic quantum dot in the presence of an external magnetic field are studied. The calculations were performed within the effective mass approximation, using the matrix diagonalization method and the compact density-matrix approach. The linear and nonlinear optical absorption coefficients between the ground （L =0） and the first excited state （L = 1） have been examined based on the computed energies and wave functions. We find that the linear, nonlinear third-order, and total optical absorption coefficients are strongly affected by the confinement strength of QDs, the external magnetic field, and the incident optical intensity.

关键词： quantum dot nonlinear optics

Negative Trions Trapped by a Spherical Parabolic Quantum Dot

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第3期45卷 565-567页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510405 China

In this paper, a negatively charged exciton trapped by a spherical parabolic quantum dot has been investigated. The energy spectra of low-lying states are calculated by means of matrix diagonalization. The important feature of the low-lying states of the negatively charged excitons in a spherical quantum dot is obtained via an analysis of the energy spectra.

关键词： trion quantum dot

Linear and Nonlinear Optical Absorptions of a Donor Impurity in Spherical Quantum Dots

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第7期52卷 155-158页

作者： xie Wen-fang School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China

An investigation of the optical properties of a hydrogenic donor in spherical parabolic quantum dots hasbeen performed by using the matrix diagonalization *** optical absorption coefficient between the ground(L=0) and the first excited state (L=1) have been examined based on the computed energies and wave *** results are presented as a function of the incident photon energy for the different values of the confinement *** results show the effects of the quantum size and the impurity on the optical absorption coefficient of a donorimpurity quantum dot.

关键词： quantum dot optical absorption

Binding Energy of Excitons in a Quantum Ring

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第8期50卷 529-531页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

The binding energy of excitons confined to a quantum ring under the influence of perpendicular homogeneous magnetic field is calculated as a function of the ring radius. Calculations are made by using the method of exact diagonalization within the effective-mass approximation. The feature of binding energy of the ground state as a function of the ring radius for several values of the magnetic field has been revealed. The interesting feature of our study is that, in a quantum ring, the geometric structure of exeitons may reveal transition.

关键词： quantum ring exciton

Feature of Low-Lying States of a Planar Three-Boson System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第3期45卷 535-538页

作者： xie Wen-fang Department of Physics Guangzhou University Guangzhou 510405 China

The energy spectrum of the low-lying states of a system of three charged bosons confined in a twodimensional harmonic trap is investigated as a function of the confinement strength ω0 by means of the exact diagonalization of the Hamiltonian. The important feature of the low-lying states of three charged bosons in two-dimensional space is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum