Temat: 73.20.Dx - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Cyclotron-Intersubband Coupling in Periodically Modulated Quasi-Two-Dimensional Electron Gas
Autorzy:: Załużny, M.
Stańko, T.
Powiązania:: https://bibliotekanauki.pl/articles/1968453.pdf
Data publikacji:: 1997-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.61.Ey
73.20.Dx
Opis:: The problem of the coupling between the Landau levels originating from the ground and first excited subband in laterally modulated quasi-two-dimensional systems in the presence of the tilted magnetic field is discussed in the framework of the one-electron perturbation theory. It was found that the tilting of the superlattice potential leads to the strong dependence of this coupling on the orientation of the magnetic field with respect to the lateral confinement direction.
Źródło:: Acta Physica Polonica A; 1997, 92, 5; 1072-1074
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Universal Behaviour of Magnetoconductance due to Weak Localization in Two-Dimensional Systems - Example of GaInAs Quantum Wells
Autorzy:: Zduniak, A.
Dyakonov, M. I.
Litwin-Staszewska, E.
Knap, W.
Powiązania:: https://bibliotekanauki.pl/articles/1943851.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.61.Ey
73.20.Dx
Opis:: Weak localization corrections to conductivity of a two-dimensional electron gas are studied by measurements of the magnetic field dependence of the conductivity in GalnAs quantum wells. We observe that, when presented as a function of the normalized magnetic field (x = B/B$\text{}_{tr}$, where B is the magnetic field, B$\text{}_{tr}$ = ħ/4eτD, D is the diffusion constant and τ is momentum relaxation time), different samples show very similar high field behaviour. A theoretical description is developed that allows one to describe in a consistent way high and low field behaviour. The theory predicts universal (B$\text{}^{1}\text{}^{/}\text{}^{2}$) behaviour of the conductivity correction for all 2D systems in the high field limit (r > 1). Low field behaviour depends strongly on spin and phase relaxation mechanisms. Comparison of the theory with experiment confirms the universal behaviour in the high field limit and allows one to estimate the spin and phase relaxation times for different GaInAs quantum wells.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 1053-1057
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Landauer Conductance of Generalized Fibonacci-Type Semiconductor Superlattices
Autorzy:: Salejda, W.
Kubisa, M.
Misiewicz, J.
Ryczko, K.
Tyc, M.
Powiązania:: https://bibliotekanauki.pl/articles/1992188.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.-c
73.20.Dx
73.61.Ey
Opis:: The quantum model of quasi-one-dimensional generalized Fibonacci semiconductor superlattice with the mass of charge carriers depending on the position in superlattice is formulated. The Landauer electrical conductance σ$\text{}_{L}$ of generalized Fibonacci semiconductor superlattice is studied analytically and numerically. The dynamical maps allowing us to calculate σ$\text{}_{L}$ of the studied systems are presented. It is shown that σ$\text{}_{L}$ as a function of incident energy E of charge carriers oscillates strongly and exhibits the resonant character. We have verified numerically that σ$\text{}_{L}$(E) reaches its local maximum for energies E corresponding to energy eigenvalues of charges in superlattice.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 514-518
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Acceptor in Quantum Dot in Cubic Semiconductors
Autorzy:: Janiszewski, P.
Suffczyński, M.
Powiązania:: https://bibliotekanauki.pl/articles/1943960.pdf
Data publikacji:: 1995-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.66.Fd
73.61.Ey
73.20.Dx
Opis:: Energy levels and oscillator strengths for transitions between the lowest states of an acceptor in a quantum dot of finite potential barrier in cubic semiconductors have been computed in the effective-mass approximation. The degeneracy of the valence band in cubic semiconductors was taken into account in the spherical approximation. Variational envelope functions consisted of a finite basis of exponentials, and had to satisfy appropriate boundary conditions to ensure the hermiticity of the Hamiltonian matrix. In typical cubic semiconductors we have found enhanced values, by an order of magnitude, of oscillator strengths for the acceptor optical transitions in the dots of radii comparable to the acceptor diameter.
Źródło:: Acta Physica Polonica A; 1995, 88, 6; 1171-1177
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Phonon Confinement and Electron Capture Time in Quantum Well
Autorzy:: Kálna, K.
Powiązania:: https://bibliotekanauki.pl/articles/1968118.pdf
Data publikacji:: 1997-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.15.Nj
73.61.Ey
73.20.Dx
Opis:: The electron capture time via an electron-polar optical phonon interaction is calculated considering the confinement of a phonon in a GaAs quantum well laser structure. The effect of the phonon confinement decreases the electron capture time about twice comparing the electron capture time obtained from the interaction of an electron with the bulk phonon.
Źródło:: Acta Physica Polonica A; 1997, 92, 4; 805-808
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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