Temat: 72.20.-I - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Metastability of Localized Neutral Donor State In GaAs
Autorzy:: Skierbiszewski, C.
Jantsch, W.
Lübke, K.
Wilamowski, Z.
Suski, T.
Powiązania:: https://bibliotekanauki.pl/articles/1933994.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Fr
71.55.-i
Opis:: Investigations of the photoconductivity of GaAs:Ge under hydrostatic pressure show, in addition to the well known persistent photoconductivity due to the DX state, another giant photoconductivity caused by a neutral localised "A₁" state of the donor. We find that the top of the barrier for the electron recapture to the Α₁ state is pinned to the conduction band edge and the capture cross-section σ(T → ∞) is surprisingly small.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 905-908
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: DX Puzzle: Where Are We Now?
Autorzy:: Wilamowski, Z.
Suski, T.
Jantsch, W.
Powiązania:: https://bibliotekanauki.pl/articles/1920958.pdf
Data publikacji:: 1992-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Jv
71.55.-i
Opis:: A brief review of the experimental data on the metastable DX-centers in AlGaAs is presented. The experimental proofs of the two-electron nature and of the intermediate, one-electron state of the DX-centers are discussed. We collect the available experimental data on the ground state, electron-emission and capture energies and we discuss the nature of the lattice barrier. The effect of splitting of these energies in AlGaAs alloys and the consequences of the splitting on the capture and emission kinetics are analyzed. The different character of the barrier and of the alloy splitting for donors of the IV and VI group is underlined. The necessity to consider the interdonor Coulomb interaction when discussing the experimental data is also pointed out.
Źródło:: Acta Physica Polonica A; 1992, 82, 4; 561-571
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Coulomb versus Madelung Gap: Ordering in a System of Point Charges
Autorzy:: Sobkowicz, P.
Wilamowski, Z.
Kossut, J.
Powiązania:: https://bibliotekanauki.pl/articles/1929618.pdf
Data publikacji:: 1993-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.-i
72.20.Fr
Opis:: Spatial correlations of impurity charges in a mixed valence regime are studied with the use of Monte Carlo simulations. The influence of various kinds of disorder on the one-particle density of states is determined. A continuous transitions from a "soft" Coulomb gap (density of states vanishing only at the chemical potential) to a "hard" gap (with a finite range of energies with vanishing density of states) is found, driven by decreasing amount of built-in disorder in the system. The "hard" Coulomb gap resembles the Madelung gap, found in crystalline arrangements of charges. The similarity reflects the fact that both the Coulomb and Madelung gaps are manifestations of the same phenomenon, resulting from ordering of the positions of point charges, the only difference being the range of correlations.
Źródło:: Acta Physica Polonica A; 1993, 84, 3; 515-518
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Photoconductivity in GaAlAs:Si Proves Negative U of DX Centers
Autorzy:: Wilamowski, Z.
Jantsch, W.
Ostermayer, G.
Powiązania:: https://bibliotekanauki.pl/articles/1888154.pdf
Data publikacji:: 1991-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Jv
71.55.-i
Opis:: The analysis of the temperature dependence of the photoconductivity, amplitude in doped GaAlAs, provides a simple and convincing proof of the negative sign of the Hubbard correlation energy U, strictly speaking of the two-electron nature of the thermal emission process from DX centers. The proof is based on a comparison of the emission activation energy measured per emission event (DLTS) with that measured per electron.
Źródło:: Acta Physica Polonica A; 1991, 80, 2; 283-286
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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