Temat: 73.22.Dj - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Electron and Hole States in Closed Spherical Quantum Dot with Linearly Graded Composition
Autorzy:: Kostić, R.
Stojanović, D.
Powiązania:: https://bibliotekanauki.pl/articles/1808044.pdf
Data publikacji:: 2009-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.22.Dj
73.21.La
Opis:: The theoretical investigation of the electron and hole spectra in a quantum dot with a linearly graded composition within the effective mass approximation is presented. The particular example is β-HgS surrounded by CdS. β-HgS core of radius $r_C$ is surrounded by concentric spherical layers each of $Hg_{1-x}Cd_{x}S$ composition (x is function of r) and finally, form radius $r_S$ by CdS. The existence of these intermediate layers, as model of graded composition, influences rapidly electron and hole spectra.
Źródło:: Acta Physica Polonica A; 2009, 115, 4; 768-770
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Electronic structure calculations of InP-based coupled quantum dot-quantum well structures
Autorzy:: Andrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1160527.pdf
Data publikacji:: 2016-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.21.La
73.21.Fg
73.22.Dj
74.50.+r
Opis:: In this work we investigate the electronic structure of coupled 0D-2D nanostructures. The respective confined state energy levels in a quantum dot-quantum well system are calculated for various conduction band offsets - between the quantum dot and surrounding material. The calculated electron and hole energy levels with their wave functions allow determining if the wave functions are within the injector quantum well or within the quantum dot and if the carrier positions on the energy scale are appropriate from the point of view of a possible laser structure utilizing the so-called tunnel injection scheme. It is shown that for an adequate width of an injector quantum well and the conduction band offsets designing an optimal tunnel injection structure is possible.
Źródło:: Acta Physica Polonica A; 2016, 129, 1a; A-97-A-99
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Electron and Exciton Quasi-Stationary s-States in Open Spherical Quantum Dots
Autorzy:: Tkach, M.
Seti, Ju.
Voitsekhivska, O.
Powiązania:: https://bibliotekanauki.pl/articles/1419890.pdf
Data publikacji:: 2012-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.15.Dx
73.21.La
73.22.Dj
73.90.+f
Opis:: The theoretical calculation of spectral parameters of electron and exciton quasi-stationary s-states in open spherical quantum dot is performed within the effective mass approximation and rectangular potentials model. The conceptions of probability distribution functions (over quasi-momentum or energy) of electron location inside of quantum dot and their spectral characteristics: generalized resonance energies and widths are introduced. It is shown that the generalized resonance energies and widths, obtained within the distribution functions, satisfy the Heisenberg uncertainty principle for the barrier widths varying from zero to infinity. At the same time, the ordinary resonance energies and widths defined as complex poles of scattering S-matrix, do not satisfy it for the small barrier widths and, therefore, are correct only for the open quantum dots with rather wide potential barriers.
Źródło:: Acta Physica Polonica A; 2012, 122, 1; 207-211
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Excitonic Magnetoabsorption of Cylindrical Quantum Disks
Autorzy:: Schillak, P.
Czajkowski, G.
Powiązania:: https://bibliotekanauki.pl/articles/1492888.pdf
Data publikacji:: 2011-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.67.Hc
73.22.Dj
73.21.La
71.35.Ji
Opis:: We show how to compute the optical functions (the complex magnetosusceptibility, dielectric function, magnetoreflection) for semiconductor quantum disks exposed to a uniform magnetic field in the growth direction, including the excitonic effects. The method uses the microscopic calculation of nanostructure excitonic wave functions and energy levels, and the macroscopic real density matrix approach to compute the electromagnetic fields and susceptibilities. The electron-hole screened Coulomb potential is adapted and the valence band structure is taken into account in the cylindrical approximation, thus separating light- and heavy-hole motions. The confinement potentials are taken as step-like both in the z and in-plane directions. Numerical calculations have been performed for $In_{0.55}Al_{0.45}As$ (disk)/$Al_{0.35}Ga_{0.65}As$ (barrier) and InP/GaP disks and the results are in a good agreement with the available experimental data.
Źródło:: Acta Physica Polonica A; 2011, 120, 5; 888-890
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Determination of Quantum Dot Morphology from Magnetooptical Properties
Autorzy:: Křápek, V.
Schliwa, A.
Bimberg, D.
Powiązania:: https://bibliotekanauki.pl/articles/2047692.pdf
Data publikacji:: 2007-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.21.La
73.22.Dj
73.43.Cd
73.61.Ey
78.20.Bh
78.20.Ls
Opis:: We present here the calculations of magnetooptical properties in InAs/GaAs quantum dots with different shapes, including excitonic effects. The influence of several structural parameters, such as vertical profile, aspect ratio, and basis squareness is discussed, as well as the possibility to retrieve the structural parameters from magnetooptical measurements.
Źródło:: Acta Physica Polonica A; 2007, 112, 2; 339-343
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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