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Wyświetlanie 1-15 z 27
Tytuł:
FIR Magnetooptical Measurements on MOCVD Grown InAs
Autorzy:
Andrearczyk, T.
Karpierz, K.
Bożek, R.
Stępniewski, R.
Grynberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968009.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-m
71.55.-i
72.40.+w
Opis:
In this paper we report results of magnetooptical measurements done on standard InAs MOCVD layers grown on GaAs. Extremely narrow lines (half-widths of the order of 20 mT) - narrower than found by other authors in high quality MBE InAs epilayers on GaAs - as well as the lines of typical half-widths have been found both in the photoconductivity spectra and in the transmission spectra. A detailed comparison with the theoretical dependence of shallow donor and Landau level energies on magnetic field leads to the conclusion that they originate from cyclotron resonance and impurity-shifted cyclotron resonance transitions in that material.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 699-703
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Spectra of Bismuth Oxyhalide Single Crystals
Autorzy:
Bunda, S.
Bunda, V.
Powiązania:
https://bibliotekanauki.pl/articles/1368693.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.22.-m
78.30.Am
78.30.Fs
Opis:
Oxyhalogenides of bismuth BiOX (X=Cl, Br and I) are very interesting materials which find various applications as X-ray luminescent screens, anti-Stokes (frequency upshift) converters, luminophors, and photoconducting analyzers of linear polarized radiation. Since each primitive cell consist of six monoatomic sites, the structure of the reduced representation of the 15 normal modes of vibration is: Γ= $2A_{1g}(Ra.)+B_{1g}(Ra.)+ 3E_{g}(Ra.)+ 2A_{2u}(i.r.)+ 2E_{u}(i.r.)$, in which the vibrations of $A_{1g}$, $B_{1g}$ and $E_{g}$ species are active in the Raman spectrum and those of $A_{2u}$ and $E_{u}$ species are active in the infrared (i.r.) spectrum. The Raman active modes are observed in frequency range 55 - 225 $cm^{-1}$, 50 - 185 $cm^{-1 }$, and 45 - 175 $cm^{-1}$ for the BiOCl, BiOBr and BiOI single crystals respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 272-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Investigation of Rare-Earth Doped Phosphate Glasses Containing Silver Nanoparticles
Autorzy:
Amjad, R.
Sahar, M.
Ghoshal, S.
Dousti, M.
Samavati, M.
Riaz, S.
Tahir, B.
Powiązania:
https://bibliotekanauki.pl/articles/1400152.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Ly
78.55.-m
78.66.Jg
Opis:
Phosphate glasses having compositions $(59.5-x)P_2O_5-40MgO-xAgCl-0.5Er_2O_3$, where x=0, 1.5 mol.% is prepared using melt-quenching technique. Infrared, absorption and photoluminescence spectra of $Er^{3+}$-doped magnesium phosphate glasses have been reported. The amorphous nature of the host glass is confirmed by X-ray diffraction technique. Transmission electron microscope image confirms the existence of silver nanoparticles inside the glass matrix. The localized surface plasmon resonance band of silver is found to be located around ≈ 528 nm for the $Er^{3+}$ free sample. A frequency upconversion process from infrared to visible is observed on excitation with 797 nm radiation. Furthermore, an enhancement in the emission at 540 nm and 632 nm is found due to the local field effect of silver nanoparticles. Our findings may contribute towards the development of solid state laser and sensors.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 746-749
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-MCD Study of Expanded Lattice Permanent Magnet Materials
Autorzy:
Kapusta, Cz.
Mycielski, R.
Porębska, B.
Ahlers, D.
Attenkofer, K.
Fischer, P.
Schütz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1964141.pdf
Data publikacji:
1997-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
75.30.-m
Opis:
X-ray magnetic circular dichroism measurements on the cobalt (iron) K edges and samarium L$\text{}_{2}$, L$\text{}_{3}$ edges of Sm$\text{}_{2}$Fe$\text{}_{17}$, Sm$\text{}_{2}$Co$\text{}_{17}$ and their interstitial hydrides and nitrides are reported. Normal absorption profiles show considerable changes upon nitriding for iron- and cobalt K edge and for samarium L$\text{}_{2}$, L$\text{}_{3}$ edges. Much weaker changes are observed upon hydriding. Similarly, significant differences of X-MCD spectra appear between the host Sm$\text{}_{2}$Fe$\text{}_{17}$ (Sm$\text{}_{2}$Co$\text{}_{17}$) and the nitrides, whereas X-MCD signals of the hydrides are similar to those of the hosts. The effects are analysed and discussed in terms of influence of interstitial atom neighbours on the Co(Fe) 4p and Sm 5d electronic bands.
Źródło:
Acta Physica Polonica A; 1997, 91, 5; 975-979
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intercalation of Layered Metal Iodides with Pyridine Evidenced by Raman Spectroscopy
Autorzy:
Preda, N.
Mihut, L.
Baibarac, M.
Baltog, I.
Powiązania:
https://bibliotekanauki.pl/articles/1807830.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Tx
78.30.-j
78.55.-m
Opis:
$PbI_2$, $BiI_3$, $CdI_2$ and AgI crystalline samples intercalated with pyridine have been studied by Raman spectroscopy. Comparing the Raman spectra of pristine metal iodides with those of intercalated samples we have shown the coexistence, in the host crystalline lattice, of two adsorbed forms: a physisorbed one, featured by weak forces of van der Waals type and a chemisorbed one, involving stronger forces related to an electrostatic interaction. The physisorbed form is consistent with the molecules inserted into the interlayer spaces while the chemisorbed form is represented by the molecules forming coordination complexes with the crystalline lattice cations. The crucial role in the formation of such complexes is played by the lone pair of nitrogen atom belonging to the molecules.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 81-83
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Raman Spectra of CdTe/ZnTe Self Assembled Quantum Dots
Autorzy:
Romčević, N.
Romčević, M.
Kostić, R.
Stojanović, D.
Abolmasov, B.
Karczewski, G.
Galazka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1807840.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.22.-m
78.30.Fs
78.55.Et
Opis:
In this paper we present Raman scattering and photoluminescence spectra measured on CdTe/ZnTe self assembled quantum dots. The photoluminescence spectrum has shown two main emission peaks, both connected with existing of quantum dots. One presents direct deexcitation to ground state and the other is optical phonon (οmega = 207.3 $cm^{-1}$)-assisted deexcitation. The registered multiphonon emission process depends on temperature. At low temperature phonon spectra shows line at 450 $cm^{-1}$ (TA + 2LO in ZnTe) and 595 $cm^{-1}$ (2LO + TO(Γ) in ZnTe).
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 88-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiative Recombination Spectra of Heavily p-Type δ-Doped GaAs/AlAs MQWs
Autorzy:
Kundrotas, J.
Čerškus, A.
Valušis, G.
Lachab, M.
Khanna, S.
Harrison, P.
Linfield, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813382.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
78.67.De
71.30.+h
Opis:
We present a study of the photoluminescence properties of heavily Be δ-doped GaAs/AlAs multiple quantum wells measured at room and liquid nitrogen temperatures. Possible mechanisms for photocarriers recombination are discussed, with a particular focus on the peculiarities of the excitonic and free carriers-acceptors photoluminescence emissions occurring below and above the Mott metal-insulator transition. Moreover, based on a simple theoretical model, it is found that the critical impurities concentration to observe the Mott transition in the multiple quantum wells samples exhibiting 15 nm wells width and 5 nm thick barrier layers is ≈3×$10^{12} cm^{-2}$.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 963-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar Cell Emitters Fabricated by Flash Lamp Millisecond Annealing
Autorzy:
Prucnal, S.
Shumann, T.
Skorupa, W.
Abendroth, B.
Krockert, K.
Möller, H.
Powiązania:
https://bibliotekanauki.pl/articles/1503796.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.40.jj
78.55.-m
78.30.Am
78.55.Ap
Opis:
Phosphorus ion implantation was used for the emitter formation in mono- and multicrystalline silicon solar cells. After ion implantation the silicon is strongly disordered or amorphous within the ion range. Therefore subsequent annealing is required to remove the implantation damage and activate the doping element. Flash-lamp annealing offers here an alternative route for the emitter formation at overall low thermal budget. During flash-lamp annealing, only the wafer surface is heated homogeneously to very high temperatures at ms time scales, resulting in annealing of the implantation damage and electrical activation of phosphorus. However, variation of the pulse time also allows to modify the degree of annealing of the bulk region to some extent as well, which can have an influence on the gettering behaviour of metallic bulk impurities. The μ-Raman spectroscopy showed that the silicon surface is amorphous after ion implantation. It could be demonstrated that flash-lamp annealing at 800°C for 20 ms even without preheating is sufficient to recrystallize implanted silicon. The highest carrier concentration and efficiency as well as the lowest resistivity were obtained after annealing at 1200°C for 20 ms both for mono- and multicrystalline silicon wafers. Photoluminescence results point towards P-cluster formation at high annealing temperatures which affects metal impurity gettering within the emitter.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 30-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Trisodium Citrate on the Morphology and Luminescence Properties of Hydrothermally Synthesized YVO₄ Phosphor
Autorzy:
Zhang, Sa
Liang, Yan
Gao, Xiaoyong
Powiązania:
https://bibliotekanauki.pl/articles/1398668.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
61.05.cp
68.37.Hk
78.30.-j
Opis:
YVO₄ phosphors with different morphologies were synthesized by trisodium citrate (Na₃cit) surfactant-assisted hydrothermal process. Effects of molar ratio of $\text{cit}^{3-}$ to $Y^{3+}$ and pH value of reaction solution were intensively investigated on the morphologies, structures and luminescence properties of YVO₄ phosphor. The morphologies of the YVO₄ particles can be effectively controlled in strong acidic and strong alkaline environment by affecting the adsorption of $\text{cit}^{3-}$ on the (001) crystal plane of YVO₄. Strong acidic condition resulted into excessive adsorption of $\text{cit}^{3-}$ groups on the YVO₄ phosphor, which annihilated the superior luminescence of YVO₄ phosphors. On the contrary, strong alkaline condition does not result into the adsorption of $\text{cit}^{3-}$ groups. The synthesized YVO₄ phosphor without adsorption of $\text{cit}^{3-}$ groups showed superior luminescence even though the effective control of the morphology in alkaline condition is not so good as in strong acidic condition.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 79-83
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Pressure Raman Spectroscopy in Carbon Nanotubes
Autorzy:
Kourouklis, G.
Arvanitidis, J.
Christofilos, D.
Ves, S.
Powiązania:
https://bibliotekanauki.pl/articles/1807795.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Ch
78.30.Na
63.22.-m
62.50.-p
Opis:
This work focuses on the high pressure Raman study of carbon nanostuctures comprising of single- or double-wall carbon nanotubes. The detailed examination of the Raman peaks, especially those attributed to the radial breathing modes of the carbon nanotubes, as a function of pressure provides a wealth of information concerning the pressure response of individual nanotubes as well as the internal-external tube (intratube) interactions. The radial breathing modes of both the internal and the external tubes in double-wall carbon nanotubes show reduced pressure slope values as compared to the corresponding in single-wall carbon nanotubes. The reduced slopes for the internal tubes reflect the pressure screening effect inside the external tubes, while those for the external tubes their structural reinforcement due to the encapsulation of smaller diameter tubes in their interior. Moreover, the magnitude of the pressure screening effect depends strongly on the intratube spacing and thus on the intratube interaction. All the experimental observations are well reproduced qualitatively by means of theoretical calculations based on a simple phenomenological model.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 13-18
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy
Autorzy:
Dohčević-Mitrović, Z.
Popović, Z.
Šćepanović, M.
Powiązania:
https://bibliotekanauki.pl/articles/1807800.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.22.-m
78.67.Bf
78.30.-j
61.72.uj
Opis:
Phonon-phonon interactions were investigated in various nanocrystalline powders like anatase $TiO_{2-δ}$, pure $CeO_{2-δ}$ and ceria doped with Nd(Gd) analyzing temperature dependent Raman spectra of these systems. Phonon confinement model based on size, inhomogeneous strain and anharmonic effects was used to properly describe the evident changes present in the Raman spectra of pure and doped ceria nanocrystalline samples. In small particles of pure and doped ceria nanocrystals, when size effects have minor impact on Raman modes, four phonon anharmonic processes prevail under the three-phonon ones. When nanopowdered particles are grown enough size effects provoke changes of the anharmonic interactions when three-phonon coupling prevails over the four-phonon anharmonic processes. In nanocrystalline anatase $TiO_2$ evident blueshift of the most prominent $E_g$ Raman mode probably originates from dominant four-phonon anharmonic interactions.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 36-41
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equimolecular Mixture of Calamitic and Bent-Core Thiobenzoates
Autorzy:
Chruściel, J.
Wantusiak, B.
Ossowska-Chruściel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419573.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.M-
78.15.+e
Opis:
This article reports on the new results on phase transitions, mesomorphic and electro-optical properties of new equimolecular mixture of calamitic and bent-core thiobenzoates. Two following liquid crystals were the components of the binary mixture: (S)-(+)-4-(1-methylheptyloxy)biphenyl 4'-octylthiobenzoate (MHOBS8) having rode-like, calamitic-chiral molecules possessing among others ferroelectric smectic C (SmC*) and bis [4-(4'-octylphenylthiocarbonyl)phenyl] isophtalates from a homologous series of banana-shaped thioesters, referred to as IFOS8, where n = 8 denoted the number of carbon atoms in terminal alkyl chains in both mesogens, synthesized by us. The IFOS8 compound has two enantiotropic phases: B2 with antiferroelectric order and B6. The mesomorphic properties were investigated by means of three complementary methods: differential scanning calorimetry, polarized light optical microscopy, and transmitted light intensity. Electro-optical measurements were also carried out.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 375-377
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Induced Modification of Graphene Oxide Layers on GaN Basis
Autorzy:
Łopion, A.
Stobiński, L.
Pakuła, K.
Bożek, R.
Kaźmierczak, P.
Wysmołek, A.
Stępniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1185429.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
78.55.-m
78.30.-j
07.05.Kf
Opis:
Graphene oxide suspension in various solvents was spin coated on metal organic vapor phase epitaxy grown GaN/saphire layers. Samples were characterised using the Raman spectroscopy and atomic force microscopy, before and after high temperature treatment. We found that graphene oxide was modifed by high temperature treatment, however a considerable modification was also observed as a result of impinged laser light incident due to the measurements. The Raman spectra were decomposed into two contributions showing different behaviour during the Raman scattering measurements.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1169-1171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Substrate on Vibrational Properties of Single-Layer MoS₂
Autorzy:
Gołasa, K.
Molas, M.
Nogajewski, K.
Grzeszczyk, M.
Zinkiewicz, M.
Potemski, M.
Babiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1398570.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.22.-m
71.35.-y
78.20.-e
78.30.-j
Opis:
We report on the Raman scattering from single-layer molybdenum disulfide (MoS₂) deposited on various substrates: Si/SiO₂, hexagonal boron nitride (h-BN), sapphire, as well as suspended. Room temperature Raman scattering spectra are investigated under both resonant (632.8 nm) and non-resonant (514.5 nm) excitations. A rather weak influence of the substrate on the Raman scattering signal is observed. The most pronounced, although still small, is the effect of h-BN, which manifests itself in the change of energy positions of the E' and A'₁ Raman modes of single-layer MoS₂. We interpret this modification as originating from van der Waals interaction between the MoS₂ and h-BN layers.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1172-1175
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strong Photoluminescence Fluctuations in Laser-Thinned Few-Layer WS₂
Autorzy:
Bala, Ł.
Łacińska, E.
Nogajewski, K.
Molas, M.
Wysmołek, A.
Potemski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398573.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
71.35.-y
78.55.-m
78.30.-j
Opis:
We present results of μ-Raman and μ-photoluminescence study of few-layer WS₂ flakes that have been locally thinned down by a focused laser beam. The Raman spectroscopy measurements prove that the investigated flake was locally thinned down to a monolayer. Interestingly, μ-photoluminescence experiments allowed us to observe huge intensity fluctuations at the boundary of laser-thinned region. Similar effects were found at the edges of a WS₂ bilayer flake, which has not been subjected to laser-thinning. The origin of the observed time evolution of the photoluminescence response is discussed in terms of potential fluctuations resulting from light-induced changes of the charge state of defects.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1176-1178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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