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Wyszukujesz frazę "Wróbel, G." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-15 z 15
    Tytuł:
    Optical Studies of HgCdMnTe Bicrystals
    Autorzy:
    Grabecki, G.
    Wróbel, J.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1879930.pdf
    Data publikacji:
    1991-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    73.40.Lq
    Opis:
    We report preliminary results of optical measurements performed on Hg$\text{}_{1-x-k}$Cd$\text{}_{x}$Mn$\text{}_{k}$Te grain boundaries. Photovoltaic spectra and I-V characteristics under illumination exhibit metastable behavior, confirming our previous conclusions based on transport measurements under high hydrostatic pressure.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 2-3; 221-223
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In the Search of Electron Correlation Effects in DNA
    Autorzy:
    Wróbel, A.
    Wróbel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537235.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.14.gk
    75.20.-g
    71.10.Fd
    Opis:
    We discuss the energy scale separation induced in DNA by gaps between molecular orbital states of individual bases and by electron correlations. We also demonstrate how this separation gives rise to effective low energy models of electron transport in DNA.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 409-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Localization in Sb-Doped Si/SiGe Superlattices
    Autorzy:
    Dietl, T.
    Jaroszyński, J.
    Sawicki, M.
    Głód, P.
    Wróbel, J.
    Stöger, G.
    Brunthaler, G.
    Bauer, G.
    Schäffler, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933732.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Cw
    72.15.Rn
    73.20.Fz
    Opis:
    Millikelvin studies of in-plane magnetoconductance in short period Si/Ge:Sb superlattices have been carried out in order to examine the effect of anisotropy on quantum localization. The field-induced metal-to-insulator transition has been observed, indicating the existence of extended states. This suggests that despite anisotropy as large as D $\text{}_{∥}$/D$\text{}_{⊥}$ ≈ 10$\text{}^{3}$ the system behaves as 3D in respect of localization by disorder.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 699-702
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Ballistic Transport in Wires of n-PbTe
    Autorzy:
    Grabecki, G.
    Wróbel, J.
    Dietl, T.
    Papis, E.
    Kamińska, E.
    Piotrowska, A.
    Ueta, Y.
    Sprinholtz, G.
    Bauer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968110.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.-r
    73.23.Ad
    73.50.Dn
    Opis:
    We present results of magnetotransport studies on quantum wires of submicron PbTe epilayers, fabricated by means of electron beam lithography and dry etching. When the wire width is reduced down to 1 μm, the transition from diffusive to ballistic regime is observed. Effects associated with collimation and boundary scattering are found in the Hall, longitudinal, and van der Pauw magnetoresistance for wires and junctions in the shape of a cross.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 789-792
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conductance Anomalies in Strained Quantum Wires: the Case of PbSe and PbTe
    Autorzy:
    Grabecki, G.
    Wróbel, J.
    Dietl, T.
    Sawicki, M.
    Skośkiewicz, T.
    Papis, E.
    Kamińska, E.
    Piotrowska, A.
    Frank, N.
    Ueta, Y.
    Sprinholtz, G.
    Bauer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950800.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Jv
    Opis:
    We show that conducting edge channels are formed in free standing wires of PbSe/BaF$\text{}_{2}$ and PbTe/BaF$\text{}_{2}$ as temperature is lowered. The effect results from spatially inhomogeneous strain caused by a difference between the thermal expansion coefficients of the epilayer and the substrate. The presence of the edge channels can explain anomalous mesoscopic effects observed previously in these wires.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 797-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation of Two-Dimensional Electron Gas in LPE-Grown GaInAs-InP Heterostructures
    Autorzy:
    Fronc, K.
    Grabecki, G.
    Wróbel, J.
    Dietl, T.
    Gajewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891365.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Df
    73.20.Dx
    73.60.Br
    Opis:
    A series of GaInAs/InP heterostructures was grown by liquid phase epitaxy. The heterostructures were characterized by magnetotransport measurements carried out down to 1.8 K and up 10 T. The results demonstrate the existence of the high-mobility two-dimensional electron gas in the narrow-gap GaInAs as well as the presence of residual conductance through the InP buffer layer.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 449-452
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrostatic Gates for GaN/AlGaN Quantum Point Contacts
    Autorzy:
    Czapkiewicz, M.
    Cywiński, G.
    Dybko, K.
    Siekacz, M.
    Wolny, P.
    Gierałtowska, S.
    Guziewicz, E.
    Skierbiszewski, C.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403637.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Qv
    73.61.Ng
    73.23.-b
    Opis:
    We report on AlGaN/GaN quantum point contacts fabricated by using e-beam lithography and dry ion etching. The tunable nano-constrictions are defined by the integration of side and top gates in a single device. In this configuration, the planar gates are located on the both sides of a quantum channel and the metallic top gates, which cover the active region, are separated from the substrate by an insulating and passivating layers of $HfO_2$ or $Al_2O_3//HfO_2$ composite. The properties of devices have been tested at T = 4.2 K. For side gates we have obtained a very small surface leakage current $I_g < 10^{-11}$ A at gate voltages $|V_g|$ < 2 V, however, it is not enough to close the quantum channel. With top gates we have been able to reach the pinch-off voltage at $V_g$ = - 3.5 V at a cost of $I_g ≈ 10^{-6} A$, which has been identified as a bulk leakage current.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1026-1028
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Properties of ZnO and ZnCdO Nanowires
    Autorzy:
    Zaleszczyk, W.
    Fronc, K.
    Aleszkiewicz, M.
    Paszkowicz, W.
    Wróbel, J.
    Dłużewski, P.
    Kret, S.
    Klepka, M.
    Kłopotowski, Ł.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047698.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    We report on the photoluminescence studies of ZnO and ZnCdO nanowires grown on SiO$\text{}_{2}$/Si substrates by low-pressure vapor phase synthesis. X-ray diffraction and transmission electron microscopy measurements show that the crystallographic structure of these ZnO and ZnCdO nanowires is of wurtzite-type with a high crystal perfection. Surface morphology of samples was determined by scanning electron microscopy and atomic force microscopy. The photoluminescence spectra of as-grown nanowires, nanowires extracted from the substrate and deposited onto Si wafer, and nanowires dispersed in ethanol by sonication were investigated at room temperature and compared to each other. The temperature dependence of the near band-gap photoluminescence emitted by the as-grown nanowires was also measured and analyzed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 357-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dimensional Crossovers in Magnetoresistance of Submicron Films and Wires of CdTe:In
    Autorzy:
    Jaroszyński, J.
    Wróbel, J.
    Sawicki, M.
    Skośkiewicz, T.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Dietl, T.
    Kamińska, E.
    Papis, E.
    Piotrowska, A.
    Duś, R.
    Nowakowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952536.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Jv
    Opis:
    We present millikelvin studies of magnetoresistance for epitaxial films and wires of CdTe:In. In comparison to the data with theoretical predictions for the weakly localized regime we put into the evidence the presence of the temperature-induced dimensional crossovers in the studied systems. Our measurements probe the electron phase-breaking rate and indicate that the main dephasing mechanism arises from electron scattering from thermal fluctuations of three- or two-dimensional electron liquid.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1027-1031
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Hall Ferromagnet in Magnetically-Doped Quantum Wells
    Autorzy:
    Andrearczyk, T.
    Jaroszyński, J.
    Wróbel, J.
    Karczewski, G.
    Wojtowicz, T.
    Papis, E.
    Kamińska, E.
    Piotrowska, A.
    Popović, D.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036881.pdf
    Data publikacji:
    2003-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Nq
    72.25.Dc
    73.61.Ga
    75.50.Pp
    Opis:
    The article reviews our recent studies on quantum Hall ferromagnetism in diluted magnetic semiconductors. We carried out magnetoresistance studies on modulation-doped, gated heterostructures of (Cd,Mn)Te/(Cd,Mg)Te:I. We put into evidence the formation of Ising quantum Hall ferromagnet with Curie temperature T$\text{}_{C}$ as high as 2 K. Quantum Hall ferromagnetism is manifested by anomalous magnetoresistance maxima. Moreover, magnitude of these spikes depends dramatically on the history of the sample, shows hysteresis when either magnetic field or gate voltage are swept, stretched-exponential time evolution characteristic of glassy systems, and strong Barkhausen noise. Our study suggests that these metastabilities stem from the slow dynamics of ferromagnetic domains.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 2; 93-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Electrical Properties, of ZnO-Nanowire/Si-Substrate Junctions Studied by Scanning Probe Microscopy
    Autorzy:
    Aleszkiewicz, M.
    Fronc, K.
    Wróbel, J.
    Klepka, M.
    Wojtowicz, T.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047440.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Ef
    68.37.Ps
    68.65.La
    73.21.Hb
    78.67.Lt
    Opis:
    Scanning tunneling spectroscopy was used to check the tunneling I-V characteristics of junctions formed by n-ZnO nanowires deposited on Si substrates with n- and p-type electrical conductivity (i.e. n-ZnO nanowire/n-Si and n-ZnO nanowire/p-Si junctions, respectively). Simultaneously, several phenomena which influence the measured I-V spectra were studied by atomic force microscopy. These influencing factors are: the deposition density of the nanowires, the possibility of surface modification by tip movement (difference in attraction forces between nanowires and the p-Si and n-Si) and the aging of the surface.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 255-260
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Properties of ZnO Nanowires Grown on Ni Substrate
    Autorzy:
    Zaleszczyk, W.
    Fronc, K.
    Przeździecka, E.
    Janik, E.
    Czapkiewicz, M.
    Wróbel, J.
    Paszkowicz, W.
    Kłopotowski, Ł.
    Karczewski, G.
    Wojtowicz, T.
    Presz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812028.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    Photoluminescence studies of zinc oxide nanowires produced by a carbo-thermal method on a nickel foil substrate are reported. Two types of as-grown samples: the first - containing only buffer film, and the second - containing both zinc oxide nanowires and buffer film grown in the same technological process, were investigated by means of the temperature-dependent photoluminescence. X-ray diffraction measurements of buffer film show that it is polycrystalline and is composed from wurtzite-type ZnO (main phase) and includes minority phases: rock salt type (Ni,Zn)O and hexagonal C₃N₄. The shape of the apparently monocrystalline nanowires is characterized by hexagonal section matching with the expectations of the hexagonal ZnO structure. The presence of LO-phonon replicas in photoluminescence spectra for the second sample is used as an argument for confirmation that ZnO nanowires are single crystalline. The method of growth of ZnO nanowires on nickel oxide opens perspectives to produce $Zn_{1-x}Ni_{x}O$ diluted magnetic semiconductor nanowires.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1451-1456
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composition and Microstructure of the Al-Multilayer Graphene Composites Achieved by the Intensive Deformation
    Autorzy:
    Czeppe, T.
    Korznikova, E.
    Ozga, P.
    Wrobel, M.
    Litynska-Dobrzynska, L.
    Korznikova, G.
    Korznikov, A.
    Czaja, P.
    Socha, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375203.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.05.uj
    81.05.ue
    81.05.uf
    Opis:
    The paper presents results of the studies concerning aluminum-graphene composites produced with use of step technique; first mechanical alloying of Al and graphene powders and later intensive deformation by the high pressure torsion. As a result small, thin and round samples of composites, about 10 mm in diameter were achieved. For comparison similar samples not containing graphene were investigated. The X-ray diffraction, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy were applied to study composites structures and analyze graphene content and atomic bonds. The Raman spectroscopy method suggested multilayer graphene, which could also be identified as the defected nano-graphite as a component of the composite structure as well as some small content of the aluminum carbides. The highly dispersed microstructures of aluminum matrices were identified with the transmission electron microscopy, showing difference between the samples produced with the increased number of rotations, leading to the increased deformation realized. This method revealed carbon and aluminum oxides in large amounts which is interpreted as a surface effect. This method suggested also formation of the carbon-metal and carbon-metal- oxygen atomic bonds, which might partially result from formation of the carbides.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 921-927
    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:
    Conductance Fluctuations in Quantum Wires of n-CdTe and n-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te
    Autorzy:
    Jaroszyński, J.
    Wróbel, J.
    Sawicki, M.
    Skośkiewicz, T.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Dietl, T.
    Kamińska, E.
    Papis, E.
    Barcz, A.
    Piotrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934061.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Rn
    73.61.Ga
    73.20.Fz
    Opis:
    We present millikelvin studies of magnetoconductance in submicron wires of In-doped n$\text{}^{+}$-CdTe and n$\text{}^{+}$-Cd$\text{}_{0.99}$Mn$\text{}_{0.01}$Te epilayers. Weak-field magnetoresistance which arises from quantum localization as well as universal conductance fluctuations have been observed. The exchange coupling to magnetic impurities is shown to decrease the correlation field of the fluctuations. This novel effect is interpreted by invoking a new driving mechanism of the magnetoconductance fluctuations - the redistribution of the electrons between energy levels of the system, induced by the giant s-d spin-splitting of the electronic states.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 1000-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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