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    Wyświetlanie 1-14 z 14
    Tytuł:
    MnAs Overlayer on GaN(000$\text{}_{1}$)-(1 x 1) - Its Growth, Morphology and Electronic Structure
    Autorzy:
    Kowalski, B. J.
    Kowalik, I. A.
    Iwanowski, R. J.
    Łusakowska, E.
    Sawicki, M.
    Sadowski, J.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038151.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    73.20.At
    Opis:
    MnAs layer has been grown by means of MBE on the GaN(000$\text{}_{1}$)-(1 x 1) surface. Spontaneous formation of MnAs grains with a diameter of 30-60 nm (as observed by atomic force microscopy) occurred for the layer thickness bigger than 7 ML. Ferromagnetic properties of the layer with Curie temperature higher than 330 K were detected by SQUID measurements. Electronic structure of the system was investigated in situ by resonant photoemission spectroscopy for MnAs layer thickness of 1, 2, and 8 ML. Density of the valence band states of MnAs and its changes due to the increase in the layer thickness were revealed.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 645-650
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of Mn 3d Electrons in the Valence Band of Mn/GeMnTe
    Autorzy:
    Pietrzyk, M. A.
    Kowalski, B. J.
    Orłowski, B. A.
    Knoff, W.
    Osinniy, V.
    Kowalik, I. A.
    Story, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047678.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Mq
    Opis:
    We present the results of the electronic band structure study of Ge$\text{}_{0.9}$Mn$\text{}_{0.1}$Te epilayers, clean and modified in situ by deposition of manganese atoms. The sets of resonant photoemission spectra were measured for the photon energy range covering the energy of Mn 3p→3d transition (45
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 275-281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extra-Low Temperature Growth of ZnO by Atomic Layer Deposition with Diethylzinc Precursor
    Autorzy:
    Kowalik, I. A.
    Guziewicz, E.
    Kopalko, K.
    Yatsunenko, S.
    Godlewski, M.
    Wójcik, A.
    Osinniy, V.
    Krajewski, T.
    Story, T.
    Łusakowska, E.
    Paszkowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047710.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.66.Hf
    81.15.Kk
    Opis:
    ZnO thin films were grown on silicon substrate by atomic layer deposition method. We explored double-exchange chemical reaction and used very volatile and reactive diethylzinc as a zinc precursor. These enables us to obtain zinc oxide thin films of high quality at extremely low growth temperature (90-200ºC). The films are polycrystalline as was determined by X-ray diffraction and show flat surfaces with roughness of 1-4 nm as derived from atomic force microscopy measurements. Photoluminescence studies show that an edge emission of excitonic origin is observed even at room temperature for all investigated ZnO layers deposited with the diethylzinc precursor.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 401-406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fano Resonance of Eu$\text{}^{2+}$ and Eu$\text{}^{3+}$ in (Eu,Gd)Te MBE Layers
    Autorzy:
    Orlowski, B. A.
    Kowalski, B. J.
    Dziawa, P.
    Pietrzyk, M.
    Mickievicius, S.
    Osinniy, V.
    Taliashvili, B.
    Kowalik, I. A.
    Story, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044511.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Mq
    Opis:
    Resonant photoemission spectroscopy, with application of synchrotron radiation, was used to study the valence band electronic structure of clean surface of (EuGd)Te layers. Fano-type resonant photoemission spectra corresponding to the Eu 4d-4f transition were measured to determine the contribution of 4f electrons of Eu$\text{}^{2+}$ and Eu$\text{}^{3+}$ ions to the valence band. The resonant and antiresonant photon energies of Eu$\text{}^{2+}$ ions were found as equal to 141 V and 132 eV, respectively and for Eu$\text{}^{3+}$ ions were found as equal to 146 eV and 132 eV, respectively. Contribution of Eu$\text{}^{2+}$4f electrons was found at the valence band edge while for Eu$\text{}^{3+}$ it was located in the region between 3.5 eV and 8.5 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 803-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic States of Collosal Magnetoresistive Manganites $La_{0.67}Pb_{0.33}Mn_{1-x}Fe_{x}O_{3}$ from Photoemission Spectroscopy
    Autorzy:
    Kowalik, M.
    Zalecki, R.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538821.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    79.60.Bm
    71.15.Ap
    74.20.Mn
    Opis:
    The electron photoemission spectra of valence bands and core-level states of manganese perovskite $La_{0.67}Pb_{0.33}(Mn_{1-x}Fe_{x})O_{3}$ with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 were measured by the X-ray and Ultraviolet Photoemission Spectroscopy (XPS and UPS) below and above the metal-insulator transition. From analysis of the Mn 2p core-level spectra the ratio $Mn^{3+}//Mn^{4+}$ was calculated as a function of the iron content. Comparison of the valence band spectrum with band structure calculations and with the high-resolution spectra measured at synchrotron radiation for Ca-, Ba- and Ce- substituted manganites revealed the strong hybridisation of Mn 3d and of O 2p states between -3 eV and -7 eV, and no estimated oxygen states between 0 eV and -2 eV where the Mn-3d states play a predominant role. The composition dependent insulating energy gaps were measured at room temperature. Reasons for the behaviour were discussed taking into account previous analysis of XPS/UPS spectra of other manganese perovskites.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 277-280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structure of $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$
    Autorzy:
    Tokarz, W.
    Kowalik, M.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431533.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.lx
    79.60.-i
    Opis:
    We present theoretical studies of electric and magnetic properties in manganese perovskite $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$. The calculations were carried out by means of the first-principles density functional theory (DFT) with general gradient approximation GGA+U using Wien2K package. The P-3c1 crystal structure was chosen from the detailed X-ray diffraction data for the perovskite. For Mn and Fe d electrons exact exchange energy was utilized. Different orientation of magnetic moments on Mn and Fe atoms was considered. The computed density of states display band gap for both spin orientations in accord with our previous work, indicating that this compound should show an insulating ground state
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 876-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structures of $La_{2/3}Pb_{1/3}Mn_{2/3}(Fe,Co,Ni)_{1/3}O_{3}$
    Autorzy:
    Kowalik, M.
    Tokarz, W.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385092.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.Lx
    79.60.-i
    Opis:
    We present calculations of the electronic band structures of $La_{2/3}Pb_{1/3}Mn_{2/3}(Fe,Co,Ni)_{1/3}O_{3}$ colossal magneto-resistance manganites. The calculations are based on first-principles density functional theory with general gradient approximation GGA+U using WIEN2k package. The calculations show that electronic structures of these compounds consist mainly of Mn 3d, O 2p, and (Fe,Co,Ni) 3d states, which are hybridized over whole valence bands. Substitution Mn ion by Fe, Co, or Ni ions reduces the Mn and O contributions to the valence bands and weakens the double exchange interaction. The results are in good agreement with available experimental data.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 251-253
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structure and Photoemission States of $La_{2//3}Pb_{1//3}MnO_3$
    Autorzy:
    Tokarz, W.
    Kowalik, M.
    Zalecki, R.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427488.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.Lx
    79.60.-i
    Opis:
    We present the theoretical study of electronic and magnetic properties in a manganese perovskite $La_{2//3}Pb_{1//3}MnO_3$. The calculations were carried out in frame of the first-principles density functional theory with the general gradient approximation using the WIEN 2K package. The P3c1 crystal structure was taken from the detailed X-ray diffraction data for the perovskite. The exact exchange energy was utilized for Mn d electrons. Density of states was determined by the modified tetrahedron method. As a result we get a valence band for the spin up and down density of states with the gap for the latter of 1.85 eV. We noticed that conduction band is mainly dominated by d spin up manganese electrons and $Mn (d_{xz}, d_{yz})$ states have twice larger contribution than $(d_{x^2 - y^2}, d_{xy})$. We attribute this to $Mn-O_6$ octahedral tilting. From the same reason $d_{3z^2 - r^2}$ state has no contribution to the density of states at the Fermi energy $(E_{F})$. Comparison of total density of states with the ultraviolet photoemission spectroscopy measurements shows similar features especially as far as the lead spectral intensity from the 6s electrons at about - 10 eV is concerned. The calculated total magnetic moment per formula unit is 3.66 $μ_{B}$, the measured one 3.48 $μ_{B}$/f.u.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1151-1153
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Self-Assembled CdTe/ZnTe Quantum Dots
    Autorzy:
    Kowalik, K.
    Kudelski, A.
    Golnik, A.
    Gaj, J. A.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035754.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Ej
    Opis:
    We present microluminescence investigations of self-assembled CdTe/ZnTe quantum dots. The dots proprieties resulting from our studies are: values of optical in-plane anisotropy parameters (electron - heavy hole exchange splitting and orientation of anisotropy) and value of effective Lande factor. Parameters giving information about in-plane anisotropy possess random distribution of values with the exchange splitting from 0 to 240 μeV. The effective Lande factor values for our dots are around g$\text{}^{*}$=-3.2 with a scatter of about 18%. Some PL lines exhibit sudden jumps of energetic position, related to variation of the charge state in their neighborhood.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 539-544
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structure and Photoemission States of $Bi_{1.96}Mg_{0.04}Se_3$
    Autorzy:
    Tokarz, W.
    Zalecki, R.
    Kowalik, M.
    Kołodziejczyk, A.
    Kozłowski, A.
    Miotkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374118.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.Lx
    79.60.-i
    Opis:
    We present theoretical band structure calculations and ultraviolet electron photoemission spectroscopy of a topological insulator $Bi_{1.96}Mg_{0.04}Se_3$. Our calculations were based on the first-principles density functional theory with general gradient approximation using Wien2k package with the spin-orbit interaction included by a second-variation method. The R3̅m crystal structure was optimized. In consequence, 4% decrease of volume and 3% decrease of ratio c/a was obtained. This modified structure was multiplied three times in a and b direction in order to place proper amount of Mg. Final crystal structure P3m1 with 135 atoms was used for the calculations. As a result metallic band structure was obtained with conduction band extended from -5.6 eV up to 0.16 eV. It composes mostly from Se p states. Comparison of total DOS with ultraviolet photoemission spectrum shows similar features.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-127-A-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bismuth Valence in a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_{2}O_{y}$ Superconductor from X-Ray Photoemission Spectroscopy
    Autorzy:
    Zalecki, R.
    Woch, W.
    Kowalik, M.
    Kołodziejczyk, A.
    Gritzner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537186.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Jb
    79.60.-i
    Opis:
    The X-ray electron photoemission spectra of a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_2O_{y}$ superconductor were measured with $Al K_{α}$ and $Mg K_{α}$ radiation at room temperature. The Bi 4f spectrum was compared to the same spectra of $Bi_{1.75}Pb_{0.35}Sr_{1.9}Ca_{2.05}Cu_{3.05}O_{y}$ and $Tl_{0.6}Pb_{0.4}Sr_{1.6}Ba_{0.4}Ca_2Cu_3O_{y}$ superconductors. In Bi,Pb-based superconductor only one type of $Bi^{3+}$ ions is present. The Bi 4f spectrum in the Tl,Bi-superconductor consists of two contributions due to the different valences. The component from $Bi^{5+}$ lines is in higher binding energy than from $Bi^{3+}$. The ratio of trivalent $Bi^{3+}$ to pentavalent $Bi^{5+}$ bismuth ions was calculated from decomposition of the spin-orbit split spectrum of the Bi 4f photoelectrons. The conclusion is that Bi is present in trivalent and in pentavalent form and the ratio of $Bi^{3+}$ to $Bi^{5+}$ is 1.87 ± 0.02.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 393-395
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of an Electric Field on Fine Properties of III-V and II-VI Quantum Dots Systems
    Autorzy:
    Kowalik, K.
    Krebs, O.
    Kudelski, A.
    Golnik, A.
    Lemaître, A.
    Senellart, P.
    Karczewski, G.
    Kossut, J.
    Gaj, J.
    Voisin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038219.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Ej
    Opis:
    We investigate the influence of an electric field on the optical properties of single quantum dots. For sample made of III-V compounds micron-size electro-optical structures were produced in order to apply an electric field in the dot plane. For several individual dots lines significant variations of the anisotropic exchange splitting with the field were observed. On sample made of II-VI compounds we demonstrate the influence of electric field fluctuations on the luminescence of a single quantum dot.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 177-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Photon Polarization in GaAs/AlAs Single Quantum Dot Emission
    Autorzy:
    Suffczyński, J.
    Trajnerowicz, A.
    Kazimierczuk, T.
    Piętka, B.
    Kowalik, K.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Gaj, J. A.
    Wysmołek, A.
    Stępniewski, R.
    Potemski, M.
    Thierry-Mieg, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047725.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.66.Fd
    78.67.Hc
    78.47.+p
    Opis:
    We study polarization resolved correlation between photons emitted in cascaded biexciton-exciton recombination from a single quantum dot formed in type II GaAs/AlAs bilayer. Magnetic field induced transition from anisotropy controlled to the Zeeman controlled emission was demonstrated by a circular polarization correlation between the emitted photons. A simple model describing the effect allowed us to determine the anisotropic exchange splitting of the excitonic state. This method of the anisotropic exchange splitting determination can be useful in the case when other methods are not sensitive enough.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 461-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptical Properties of (Ga,Fe)N Layers
    Autorzy:
    Papierska, J.
    Rousset, J.
    Pacuski, W.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Gaj, J.
    Suffczyński, J.
    Kowalik, I.
    Stefanowicz, W.
    Sawicki, M.
    Dietl, T.
    Navarro-Quezada, A.
    Faina, B.
    Li, T.
    Bonanni, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492954.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Hx
    78.20.Ls
    71.35.Ji
    Opis:
    Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 921-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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