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    Wyświetlanie 1-9 z 9
    Tytuł:
    On Subband Mobilities Observed in δ-doped AlGaAs/GaAs Quantum Wells and GaAs Layers
    Autorzy:
    Dobaczewski, L.
    Maude, D. K.
    Missous, M.
    Portal, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931958.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Hc
    71.55.Eq
    73.20.Dx
    Opis:
    Electronic transport phenomena in molecular beam epitaxy grown silicon δ-doped AlGaAs/GaAs quantum wells and GaAs layers were investigated. Observations of the Shubnikov-de Haas oscillations allowed to deduce the redistribution of electrons among energy subbands formed by V-shaped and rectangular wells for GaAs layers and the AlGaAs/GaAs quantum wells, respectively. In both cases the effects of illumination upon individual sub-band mobilities and carrier concentrations were studied and the manifestation of the DX centres was demonstrated.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 201-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coherent and Sequential Tunneling in High Magnetic Field
    Autorzy:
    Belyaev, A. E.
    Vitusevich, S. A.
    Maude, D.
    Portal, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968012.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    85.30.Mn
    Opis:
    In the resonant tunneling diode incorporating a wide one-sided spacer layer, an oscillation picture has been studied in both polarities of the applied voltage in high magnetic field. The results lead to the conclusion that the interference between the electron waves running in the forward direction and the ones reflected at some potential step can occur in both the emitter and collector regions. The characteristic lengths corresponding to the path of the ballistic motion of electrons were estimated. An exchange enhancement of the electronic g-factor in two-dimensional systems was observed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 704-708
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron-Electron Interaction Effects in Quantum Hall Regime of GaN/AlGaN Heterostructures
    Autorzy:
    Siekacz, M.
    Dybko, K.
    Maude, D.
    Potemski, M.
    Knap, W.
    Skierbiszewski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047676.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    73.40.-c
    73.43.Qt
    Opis:
    We measured the activation of resistivity at quantum Hall minima in high mobility two-dimensional electron gas confined at AlGaN/GaN interface. The effective g-factor and effective mass was deduced. The electron-electron interactions modify both quantities compared to their bare band values. It is found that the influence of interactions is much more pronounced onto g-factor than effective mass. The relative spin susceptibility was also calculated and compared with available theories. The best agreement was found with the ideal two-dimensional gas model in random phase approximation.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 269-273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopy of a Single Si Donor by the Resonant Tunnelling Experiment
    Autorzy:
    Baj, M.
    Gryglas, M.
    Jouault, B.
    Maude, D.
    Faini, G.
    Gennser, U.
    Cavanna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046906.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    73.40.Gk
    73.20.Hb
    72.10.Di
    72.10.Fk
    Opis:
    Resonant tunnelling via single impurities placed in a single barrier was experimentally studied. The typically observed structures in the current-voltage characteristics seem to be paired. Such a pair can be interpreted as ground and excited states of an impurity, related to X$\text{}_{xy}$ and X$\text{}_{z}$ valleys, which is in agreement with the results obtained for big mesas. However, it is not clear why X$\text{}_{xy}$ states can be seen without any phonon participation.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 157-162
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Exciton-Cyclotron Resonance in Photoluminescence of a Two-Dimensional Hole Gas
    Autorzy:
    Jadczak, J.
    Bryja, L.
    Płochocka, P.
    Wójs, A.
    Misiewicz, J.
    Maude, D.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791299.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    71.35.Ji
    71.35.Pq
    78.20.Ls
    Opis:
    A two-dimensional hole gas in an asymmetric GaAs/$Ga_{1-x}Al_{x}As$ quantum well is studied by polarization-resolved photoluminescence in high magnetic fields (up to B = 20 T) and at low temperatures (down to T = 50 mK). In addition to the previously reported dominant emission channels of various free and acceptor-bound trions, the high-energy hole cyclotron replicas of the bound states are now also observed, corresponding to the combined exciton-cyclotron resonance. Identification of different transitions in the rich, multi-peak spectra was possible by the analysis of optical selection rules and comparison of the experimental spectra with realistic numerical calculations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 852-853
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of GaMnAs Single Layers and GaInMnAs Superlattices Investigated at Low Temperature and High Magnetic Field
    Autorzy:
    Hernandez, C.
    Terki, F.
    Charar, S.
    Sadowski, J.
    Maude, D.
    Stanciu, V.
    Svedlindh, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036030.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.70.-i
    Opis:
    Magnetotransport properties of GaMnAs single layers and InGaMnAs/InGaAs superlattice structures were investigated at temperatures from 4 K to 300 K and magnetic fields up to 23 T to study the influence of carriers confinement through different structures. Both single layers and superlattice structures show paramagnetic-to-ferromagnetic phase transition. In GaMnAs/InGaAs superlattice beside the Curie temperature (T$\text{}_{c}$≈40 K), a new phase transition is observed close to 13 K.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 613-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Orbit Coupling in n-Type PbTe/PbEuTe Quantum Wells
    Autorzy:
    Peres, M. L.
    Chitta, V. A.
    Maude, D. K.
    Oliveira, N. F.
    Rappl, P. H. O.
    Ueta, A. Y.
    Abramof, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047927.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    72.25.Rb
    73.20.Fz
    73.63.Hs
    Opis:
    Magnetoresistance measurements were performed on an n-type PbTe/PbEuTe quantum well and weak antilocalization effects were observed. This indicates the presence of spin-orbit coupling phenomena and we showed that the Rashba effect is the main mechanism responsible for this spin-orbit coupling. Using the model developed by Iordanskii et al., we fitted the experimental curves and obtained the inelastic and spin-orbit scattering times. Thus we could compare the zero field energy spin-splitting predicted by the Rashba theory with the energy spin-splitting obtained from the analysis of the experimental curves. The final result confirms the theoretical prediction of strong Rashba effect on IV-VI based quantum wells.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 602-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Steps in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Observed in Coherent Transport
    Autorzy:
    Jaroszyński, J.
    Dietl, T.
    Wróbel, J.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Maude, D. K.
    van der Linden, P.
    Portal, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968114.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Rn
    73.61.Ga
    73.20.Fz
    Opis:
    Magnetoconductance measurements on submicron wires of n$\text{}^{+}$-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te were carried out up to 27 T and down to 100 mK. The inverse correlation field of the universal conductance fluctuations is found to increase abruptly in the vicinity of the magnetization steps due to Mn pairs in CdMnTe. No such effect is observed in similar wires of CdTe. These findings support a recent model, according to which the correlation field of the universal conductance fluctuations in magnetic systems is inversely proportional to the magnetic susceptibility of the localized spins.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 797-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Breakdown of the Quantum Hall Effect
    Autorzy:
    Maude, D. K.
    Rigal, L. B.
    Desrat, W.
    Potemski, M.
    Portal, J. C.
    Eaves, L.
    Wasilewski, Z. R.
    Toropov, A. I.
    Hill, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027467.pdf
    Data publikacji:
    2001-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    74.25.Dw
    Opis:
    The breakdown of the dissipationless conductance in the integer and fractional quantum Hall effect regime is reviewed. The temperature dependence of the critical current and of the critical magnetic field at breakdown bears a striking resemblance to the phase diagram of the phenomenological two-fluid Gorter-Casimir model for superconductivity. In addition, a remarkably simple scaling law exists between different filling factors.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 2; 213-226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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