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A Bound State of a Positively Charged Exciton in Quantum Dots

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Chinese Physics Letters 2001年第2期18卷 266-268页

作者： XIE wen-fang Department of Physics Guangzhou UniversityGuangzhou 510405

Using the method of few-body physics,we obtain the relation between the correlation energies of the low-lying states of the positively charged exciton X+and the radius of quantum *** also calculate the binding energies of the ground state of a positively charged exciton as a function of the electron-to-hole mass ratio for a few values of the strength of the *** find that there exists a critical mass ratioσ^(c),such that ifσ>σ^(c)(σ<σ^(c))the X^(+)configuration is stable(unstable),andσc increases as the strength of the confinement increases.

关键词： positively radius quantum

Ground-State Transitions in Two Vertically Coupled Single Electron Quantum Dots

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Chinese Physics Letters 1999年第1期16卷 53-55页

作者： XIE wen-fang Department of Physics Guangzhou Normal UniversityGuangzhou 510400

Exact results for the two vertically coupled two-dimensional single electron quantum dots are obtained as a function of magnetic *** ground-state transition is investigated and the effect of the distance between a double-layer dot on the Coulomb interaction is *** results show that when the inter-dot distance increases,a higher magnetic field is needed to induce ground-state transitions and that for sufficiently large distance no transitions ***,the short-ranged component of Coulomb interaction is important whether the ground-state transition appears in double-layer quantum dots.

关键词： field. transitions quantum

Three Charged Bosons Confined in a Harmonic Trap

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Communications in Theoretical Physics 2005年第3X期44卷 529-531页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510405 China

A system of three charged bosons confined in a harmonic trap has been investigated by an exact diagonalization. We report a calculation for the energy spectrum of the low-lying states of a system of three charged *** important feature of the low-lying states of three charged bosons in a harmonic trap is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum

Negative Trions Trapped by a Spherical Parabolic Quantum Dot

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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

Singlet-Triplet Transitions of a Poeschl-Teller Quantum Dot

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Communications in Theoretical Physics 2006年第6X期46卷 1101-1104页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

We study the energy spectra of a two-dimensional two-electron quantum dot （QD） with P6schl-Tefler confining potential under the influence of perpendicular homogeneous magnetic field. Calculations are made by using the method of numerical diagonalization of Hamiltonian matrix within the effectlve-mass approximation. A ground-state behavior （spin singlet-triplet transitions） as a function of the strength of a magnetic field is found. We find that the dot radius R of a Poeschl-Teller potential is important for the ground-state transition and the feature of ground-state for a Poeschl Teller QD and a parabolic QD is similar when R is larger. The larger the well depth, the higher the magnetic field for the singlet-triplet transition of the ground-state of two interacting electrons in a Poesehl-Teller QD.

关键词： electron-electron interaction quantum dot semiconductor

A Study of a Confined Hydrogen Negative Ion

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Communications in Theoretical Physics 2007年第6期47卷 1111-1113页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

The ground and three low-excited states of the hydrogen negative ion confined by a spherical harmonic oscillator potential are studied employing the adiabatic hyperspherical approach method. Total energies 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.

关键词： hydrogen negative ion energy spectrum

Binding Energies of a Positively Charged Exciton in a Quantum Disc

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Communications in Theoretical Physics 2005年第5X期44卷 925-928页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510405 China

The binding energies of the lowest singlet and triplet states of positively charged excitons confined to a quantum disc are studied using exact diagonalization techniques. We investigate the dependence of the binding energies on the confinement strength and on the effective electron-to-hole mass ratio. The results we have obtained show that the binding energies are closely correlated to the strength of the confinement potential and the effective electron-to-hole mass ratio.

关键词： semiconductors quantum dots

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

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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

Donor Centers in a Gaussian Potential

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Communications in Theoretical Physics 2007年第1期47卷 167-170页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

We study a neutral donor center （D^0） and a negatively charged donor center （D^-） trapped by a quantum dot, which is subjected to a Gaussian potential confinement. Calculations are made by using the method of numerical diagonalization of Hamiltonian within the effective-mass approximation. The dependence of the ground state of the neutral shallow donor and the negatively charged donor on the dot size and the potential depth is investigated. The same calculations performed with the parabolic approximation of the Gaussian potential lead to the results that are qualitatively and quantitatively different from each other.

关键词： donor quantum dots