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排序方式: 共有83条查询结果,搜索用时 15 毫秒
1.
A. V. Ghazaryan A. Kh. Manaselyan A. A. Kirakosyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2010,45(6):269-277
Electronic states in the valence band of a cylindrical ZnSe quantum dot are studied with allowance for the valence band mixing.
Dependences of the wave functions and energy levels on the quantum dot radius are calculated. The influence of a magnetic
field parallel to the quantum dot radius on the energy levels is also considered. 相似文献
2.
Effect of the dielectric-constant mismatch and magnetic field on the binding energy of hydrogenic impurities in a spherical quantum dot 总被引:1,自引:0,他引:1
Aram Kh. Manaselyan Albert A. Kirakosyan 《Physica E: Low-dimensional Systems and Nanostructures》2004,22(4):825-832
Within the effective mass approximation and variational method the effect of dielectric constant mismatch between the size-quantized semiconductor sphere, coating and surrounding environment on impurity binding energy in both the absence and presence of a magnetic field is considered. The dependences of the binding energy of a hydrogenic on-center impurity on the sphere and coating radii, alloy concentration, dielectric-constant mismatch, and magnetic field intensity are found for the GaAs–Ga1−xAlxAs–AlAs (or vacuum) system. 相似文献
3.
A. L. Vartanian M. A. Yeranosian A. A. Kirakosyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2007,42(6):230-234
Within the framework of the Li-Low-Pines model the interaction of a Wannier-Mott exciton with polar optical phonons in a cylindrical semiconductor wire is studied, taking into account the phonon confinement effect. An analytical expression for the exciton binding energy with allowance for the polaronic effect is obtained. Numerical calculations of the binding energy are carried out for AlAs/GaAs/AlAs and ZnSe/CdSe/ZnSe wires with a various degree of polarity of quantum wire materials. The polaronic shift of the binding energy of light and heavy hole excitons is calculated. 相似文献
4.
V. N. Mughnetsyan A. A. Kirakosyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2007,42(2):55-61
A new method of theoretical investigation of the interdiffusion effect on electron states in quantum dots is proposed. The
main point of the method is the replacement of the “veritable” confining potential formed due to the diffusion by a model
potential, for which the Schr?dinger equation solutions and the energy spectrum are known. In the framework of the proposed
method we calculate the positions of edges of the conduction and heavy hole bands and the absorption coefficient of interband
transitions depending on the diffusion length in spherical InxGa1−x
As/AlyGa1−y
As quantum dots, using the Wood-Saxon potential as a model one.
Original Russian Text ? V.N. Mughnetsyan, A.A. Kirakosyan, 2007, published in Izvestiya NAN Armenii, Fizika, 2007, Vol. 42,
No. 2, pp. 83–91. 相似文献
5.
Arshak L. Vartanian Mkrtich A. Yeranosyan Albert A. Kirakosyan 《Physica E: Low-dimensional Systems and Nanostructures》2005,27(4):447-456
Using a variational technique, the effect of electron-longitudinal optical (LO) phonon interaction on the ground and the first few excited states of a hydrogenic impurity in a semiconductor quantum wire of rectangular cross section under an external electric field is studied theoretically for the impurity atom doped at various positions. The results for the binding energy as well as polaronic correction are obtained as a function of the size of the wire, the applied uniform electric field and the position of the impurity. It is found that the presence of optical phonons changes significantly the values of the impurity binding energies of the system. Taking into account the electron–LO phonon interaction the 1s→2py and 1s→2pz transition energies are calculated as a function of applied electric field for different impurity positions. 相似文献
6.
V. N. Mughnetsyan A. A. Kirakosyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2008,43(4):173-176
The effect of interdiffusion of aluminum and indium atoms on the exciton emission energy and binding energy in InxGa1?xAs/AlyGa1?yAs quantum dots is studied. It is shown that the emission energy increases monotonically with increasing diffusion length, while the binding energy has a maximum. 相似文献
7.
Arshak L. Vartanian Mkrtich A. Yeranosyan Albert A. Kirakosyan 《Physica B: Condensed Matter》2007,390(1-2):256-262
The hydrogenic impurity binding energy in rectangular quantum well wire including both barriers of finite height and an applied electric field are studied. The polaron effects on the ground-state binding energy in electric field are investigated by means of Landau-Pekar variation technique. The results for the binding energy as well as polaronic correction are obtained as a function of the size of the wire, the applied electric field and the position of the impurity. Our calculations are compared with previous results in quantum wires of comparable dimensions. 相似文献
8.
JOSEF MÁLEK JINDŘICH NEČAS K. R. RAJAGOPAL 《Archive for Rational Mechanics and Analysis》2002,165(3):243-269
To describe the flows of fluids over a wide range of pressures, it is necessary to take into account the fact that the viscosity
of the fluid depends on the pressure. That the viscosity depends on the pressure has been verified by numerous careful experiments.
While the existence of solutions local-in-time to the equations governing the flows of such fluids are available for small,
special data and rather unrealistic dependence of the viscosity on the pressure, no global existence results are in place.
Our interest here is to establish the existence of weak solutions for spatially periodic three-dimensional flows that are
global in time, for a large class of physically meaningful viscosity-pressure relationships.
(Accepted May 1, 2002) Published online November 15, 2002
Communicated by S. S. ANTMAN 相似文献
9.
Zara?Kirakosyan David?B.?SaakianEmail author Chin-Kun?Hu 《Journal of statistical physics》2011,144(1):198-212
Using the Hamilton–Jacobi equation approach to study genomes of length L, we obtain 1/L corrections for the steady state population distributions and mean fitness functions for horizontal gene transfer model,
as well as for the diploid evolution model with general fitness landscapes. Our numerical solutions confirm the obtained analytic
equations. Our method could be applied to the general case of nonlinear Markov models. 相似文献
10.
MF Miller IA Franchi AS Sexton CT Pillinger 《Rapid communications in mass spectrometry : RCM》1999,13(13):1211-1217
The use of infrared laser-assisted fluorination to release oxygen from milligram quantities of silicates or other oxide mineral grains is a well-established technique. However, relatively few studies have reported the optimisation of this procedure for oxygen-17 isotope measurements. We describe here details of an analytical system using infrared (10 μm) laser-assisted fluorination, in conjunction with a dual inlet mass spectrometer of high resolving power ( approximately 250) to provide (17)O and (18)O oxygen isotope measurements from 0.5-2 mg of silicates or other oxide mineral grains. Respective precisions (1) of typically 0.08 and 0.04 per thousand are obtained for the complete analytical procedure. Departures from the mass-dependent oxygen isotope fractionation line are quantified by Delta(17)O; our precision (1) of such measurements on individual samples is shown to be +/-0.024 per thousand. In turn, this permits the offset between parallel, mass-dependent fractionation lines to be characterised to substantially greater precision than has been possible hitherto. Application of this system to investigate the (17)O versus (18)O relationship for numerous terrestrial whole-rock and mineral samples, of diverse geological origins and age, indicates that the complete data set may be described by a single, mass-dependent fractionation line of slope 0.5244+/- 0.00038 (standard error). Copyright 1999 John Wiley & Sons, Ltd. 相似文献