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Wyświetlanie 1-15 z 88
Tytuł:
Quantum-classical Correspondence in Intense Laser Field-atom Interactions
Autorzy:
Bowden, C. M.
Pethel, S. D.
Rosenberger, A. T.
Sung, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/1968504.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Rm
42.50.Hz
Opis:
High-field ionization suppression in a classical Kepler ensemble is discussed in terms of optimization with respect to pulse turn-on rate as well as pre-pulse preparation. It is argued that high-field ionization suppression is best understood in terms of reduced probability of ionization for pulsed fields, whereas for a quasi-steady field, high-field ionization suppression implies a reduced ionization rate at higher intensities. The classical ensemble is used to calculate the high-field ionization rate of a one-dimensional atomic model using a Gaussian short-range potential and the results are compared with high-frequency Floquet theory results recently reported by other authors. Better than qualitative agreement is found and the results are compared and discussed in terms of quantum superposition and classical interference. Finally, high-field ionization suppression is discussed in relation to statistical relative stability of classical orbits of the ensemble, and classical interference for both short- and long-range potentials. Correspondence with quantum superposition is interpreted in relation to quantum-classical correspondence.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 31-43
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency and voltage-dependent dielectric properties and AC electrical conductivity of (Au/Ti)/Al₂O₃/n-GaAs with thin Al₂O₃ interfacial layer at room temperature
Autorzy:
Güçlü, Ç.
Özdemır, A.
Kökce, A.
Altindal, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1065319.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.30.+y
Opis:
An (Au/Ti)/Al₂O₃/n-GaAs structure with thin (30 Å) interfacial oxide layer (Al₂O₃), formed by atomic layer deposition technique is fabricated to investigate both frequency and applied bias voltage dependences of real and imaginary parts of dielectric constant (ε' and ε'') and electric modulus (M' and M''), loss tangent tanδ and ac electrical conductivity σ_{AC} in a wide frequency range from 1000 Hz to 1 MHz at room temperature. The dielectric properties of the (Au/Ti)/Al₂O₃/n-GaAs metal-insulator-semiconductor structure are obtained using the forward and reverse bias capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements in the applied bias voltage range from -4 V to +4 V, at room temperature. Experimental results show that the dielectric parameters were strongly frequency and voltage dependent. For each frequency the (C-V) plots show a peak and the change in frequency has effect on both the intensity and position of the peak. ε', ε'' and tanδ decrease with increasing frequency, whereas σ_{AC} increases with increasing frequency at applied bias voltage. M' increases with the increasing frequency and reaches a maximum. M'' shows a peak and peak position shifts to higher frequency with increasing applied voltage. It can be concluded that the ε', ε'', tanδ, M', M'' and σ_{AC} values of the (Au/Ti)/Al₂O₃/ n-GaAs structure are strongly dependent on both the frequency and applied bias voltage especially in the depletion and accumulation region. Also, the results can be deduced to imply that the interfacial polarization is easier at low frequencies, therefore contributing to the deviation of dielectric properties and AC electrical conductivity of (Au/Ti)/Al₂O₃/n-GaAs structure.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 325-330
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations and Some Electronic Excitations of Adsorbed Alkali Metal Monolayers
Autorzy:
Hamawi, A.
Lindgren, S.-A.
Svensson, C.
Walldén, L.
Powiązania:
https://bibliotekanauki.pl/articles/1892089.pdf
Data publikacji:
1992-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Ja
73.20.Dx
79.60.Gs
78.65.Ez
42.65.Ky
Opis:
We discuss briefly data obtained for adsorbed alkali metal monolayers with three different techniques (HREELS, UPS and SHG). The vibrational spectra provide support for the traditional picture of a fractionally charged adsorbate at low coverage and a neutral one at high coverage. We ascribe a vibrational overtone reported in previous work to contamination due to residual water vapour. UPS, uncharacteristically, gives little information of interest for low coverages except for substrates with a band gap and with a surface state in the gap. For Na on Si(100) we monitor the metallization of the surface region in the monolayer coverage range and observe metal induced gap states at higher coverages. For Cs on Cu(111) the optical second harmonic generation (SHG) shows a strong monolayer coverage dependence which we ascribe to optical transitions between surface bands and to surface barrier photoabsorption indicating the potential of SHG as a probe of the details of the surface electronic structure.
Źródło:
Acta Physica Polonica A; 1992, 81, 1; 7-18
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stimulated Emission in InGaN/GaN Multiple Quantum Wells with Different Indium Content
Autorzy:
Miasojedovas, S.
Juršėnas, S.
Kurilčik, G.
Žukauskas, A.
Springis, M.
Tale, I.
Yang, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/2041743.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.45.+h
78.47.+p
78.67.De
Opis:
We report on high-excitation luminescence spectroscopy of In$\text{}_{x}$Ga$\text{}_{1-x}$N/GaN multiple quantum wells with a high indium content (x=0.22÷0.30). High excitation conditions enabled us to achieve screening of built-in field by free carriers. This allowed for the evaluation of the influence of the band potential fluctuations due to variation in In-content on optical properties. Enhanced spontaneous emission was found for x≫0.22 due to carrier localization within the chaotic band potential. Meanwhile the stimulated emission was found to be the highest for structures with x≈ 0.25-0.27. We attribute the In-content dependence of the stimulated emission intensity to a trade-off between an increased carrier density and a decrease in the density of states.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 256-260
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:
Behavior of Quantum Fisher Information of Bell Pairs under Decoherence Channels
Autorzy:
Ozaydin, F.
Altintas, A.
Bugu, S.
Yesilyurt, C.
Powiązania:
https://bibliotekanauki.pl/articles/1194957.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.-a
03.65.Ud
03.65.Yz
Opis:
Quantum Fisher information has recently been an essential tool for analyzing the phase sensitivity of the quantum states in various quantum tasks, requiring high precision, such as quantum clock synchronization, positioning and many applications which include quantum interferometers. Due to the interactions with the environment, all quantum systems are subject to various decoherence effects. Therefore the research on quantum Fisher information under decoherence has been recently attracting more attention. In this work, analyzing the quantum Fisher information, we study the phase sensitivity of bipartite quantum correlations, in particular four Bell pairs amplitude damping channels. For a specific Bell state we arrive at similar results of Greenberger-Horne-Zeilinger (GHZ) states (as expected). For the other three Bell states, we present our results which point the interesting behavior of quantum Fisher information with respect to the decoherence rate. We also find the regions where the quantum Fisher information exhibits discontinuities.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 606-607
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Cyclotron Production for Radiometal of Zirconium 89
Autorzy:
Dabkowski, A.
Paisey, S.
Talboys, M.
Marshall, C.
Powiązania:
https://bibliotekanauki.pl/articles/1402618.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.57.uk
Opis:
Zirconium 89 ($\text{}^{89}Zr$) is a promising radionuclide for development of new PET agents due to its convenient half life of 78.4 h, $\Beta^{+}$ emission rate of 23%, low maximum energy of 0.9 MeV resulting in good spatial resolution, a stable daughter isotope of yttrium-89 ($\text{}^{89}Y$) and favorable imaging characteristics, with only one significant γ -line of 909 keV emitted during decay alongside the 511 keV positron photons. Our aim was to share over 2 years of experience of producing isotopically pure $\text{}^{89}Zr$ via the $\text{}^{89}Y(p,n)^{89}Zr$ nuclear reaction with a COSTIS Solid Target System (STS) and CYCLONE 18/9 cyclotron. We optimized the yields without producing either of the long-lived impurities $\text{}^{88}Zr$ or $\text{}^{88}Y$. The degradation of the beam energy with 400 and 500 μm thick niobium foils was tested without overheating problems within 2-6 h of irradiation. From repeated measurements of activity, it was clear that there is a bi-exponential decay of radioactivity due to the short lived $\text{}^{89m}Zr$ and $\text{}^{89}Zr$. The measured half life of the longer lived radionuclide was consistent with value for $\text{}^{89}Zr$. The energy spectrum from $\text{}^{89}Zr$ had energy peaks at 511 keV and 909 keV and was consistent with $\text{}^{89}Zr$. Production of $\text{}^{89}Zr$ with 400 ($E_{p}$ = 9.8 MeV) and 500 μ m ($E_{p}$ = 11.6 MeV) thick niobium beam degrader was achieved, without producing either $\text{}^{88}Zr$ or $\text{}^{88}Y$. It was necessary to wait at least 4 hours before measuring the activity and decay correct in order to calculate the $\text{}^{89}Zr$ activity at the end of cyclotron production. Degrading the proton beam to 10 MeV produces radionuclidically pure $\text{}^{89}Zr$ with yields from 8 to 9 MBq/μAh. Whilst this is enough for pre-clinical use, the yield is not enough for either clinical use or commercial supply. Use of thinner beam degraders (400 μm) increases the proton beam energy and increases the radionuclidic yield to 15.5 MBq/μAh whilst maintaining radionuclidic purity.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1479-1482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Thermal Properties of PUF/colored Organoclay Nanocomposites
Autorzy:
Gürses, A.
Doğar, Ç.
Köktepe, S.
Mindivan, F.
Güneş, K.
Aktürk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1193114.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Np
81.70.Pg
62.23.Pq
Opis:
Recently PF resins can be also prepared by the addition of urea because urea accelerates cure process of PF resin, reduces the cost and improves its strength performance. Clays have long been used as inorganic fillers in polymer systems because of low cost, availability and improved thermal properties of resulting polymer composites. Clay nanocomposites of different types yield a marked increase in a number of properties of thermoplastic and other resins and composites. This study investigates the variation of thermal properties of PUF/colored organoclay nanocomposites with increased colored clay ratio. For this the DSC, XRD, FT-IR and HRTEM analyses were made. The XRD patterns and HRTEM images showed that clay platelets were exfoliated at the lower contents of organoclay, whereas at the higher content of organo clay tactoids were observed. The XRD analysis results implied that the amorphous behaviour increased with increased content of colored organoclay. The DSC thermograms indicated that glassy transition temperature (T_{g}) was increased, appearing prominent crystallization peaks at the lower ratios of organoclay. The T_{g} value was partially decreased and the peak intensities gradually decreased with increased content of clay. The thermogram for composite with clay content of 20% was similar to the thermogram of virgin resin. This can be attributed to the shifting of the textural structure for this composite from prominent crystalline structure to amorphous one.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 979-983
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Structures in Ultrathin Films and Nanostructures: Simulation
Autorzy:
Lévy, J.-C. S.
Ghazali, A.
Vedmedenko, E. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/2013038.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
75.50.Tt
75.60.Ch
75.40.Mg
Opis:
In magnetic ultrathin films and dots, competing exchange, anisotropy and dipolar couplings lead to a large variety of magnetic structures. These structures are obtained by means of the Monte Carlo simulations. Three classes of magnetic structures are obtained according to anisotropy-to-dipolar energy ratio: Ising striped structures, XY-spin structures with vortices, and twisted spin phases at the spin = reorientation transition. Domain wall nucleation and motion at the coercive field are also accessible.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 431-434
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiconductor Cavity Quantum Electrodynamics with Single Quantum Dots
Autorzy:
Reitzenstein, S.
Schneider, C.
Münch, S.
Kistner, C.
Strauss, M.
Huggenberger, A.
Franeck, P.
Weinmann, P.
Kamp, M.
Höfling, S.
Worschech, L.
Forchel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1791177.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
71.35.Ji
71.55.Eq
37.30.+i
Opis:
This paper summarizes recent progress achieved in the field of semiconductor cavity quantum electrodynamics with single quantum dots with the focus being on micropillar cavities. Light-matter interaction both in the strong and weak coupling regime is presented. Resonance tuning of the quantum dot by temperature, electric fields and magnetic fields is demonstrated while the strong coupling regime can be reached. Additionally, deterministic device integration of single positioned quantum dots is reported by a combination of site controlled quantum dot growth via directed nucleation and subsequent device alignment to overcome the degree of randomness of the quantum dot position in so far most common quantum dot-cavity systems.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 445-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence Correlation and Low Temperature Linewidth of Single Defect Centers in Diamond
Autorzy:
Dräbenstedt, A.
Tietz, C.
Jelezko, F.
Wrachtrup, J.
Kilin, S.
Nizovtzev, A.
Powiązania:
https://bibliotekanauki.pl/articles/2011145.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
42.30.Yc
Opis:
Low temperature fluorescence excitation spectroscopy was carried out on single nitrogen vacancy defect centers. At temperatures below 90 K the fluorescence intensity of individual centers drastically diminishes because of the population of a metastable singlet state in near resonance with the optically excited state. Low temperature fluorescence excitation spectroscopy down to 5 K becomes possible via deshelving of this state with a second laser source. Surprisingly individual centers reveal low temperature fluorescence excitation line widths around 0.6 meV.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 665-675
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymmetrically Shaped Pseudomorphic Modulation Doped Structure for Microwave Detection
Autorzy:
Kozič, A.
Paškevič, Č.
Sužiedėlis, A.
Gradauskas, J.
Ašmontas, S.
Szerling, A.
Wrzesińska, H.
Powiązania:
https://bibliotekanauki.pl/articles/2047175.pdf
Data publikacji:
2006-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.De
72.30.+q
Opis:
In this paper we propose a microwave detector based on a AlGaAs/InGaAs/GaAs structure. Its operation relies on non-uniform carrier heating of the two-dimensional electron gas in the microwave electric fields which is a result of the asymmetric shape of the device fabricated on the base of pseudomorphic modulation doped AlGaAs/InGaAs/GaAs structure. The voltage sensitivity of the device at nitrogen temperature is 38 V/W for 10 GHz radiations and is higher compared to that of modulation doped AlGaAs/GaAs of the same configuration.
Źródło:
Acta Physica Polonica A; 2006, 110, 6; 845-849
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution from the BCS to the Bose-Einstein Limit in a d-Wave Superconductor at T=0
Autorzy:
Borkowski, L. S.
Sá de Melo, C. A. R.
Powiązania:
https://bibliotekanauki.pl/articles/2027398.pdf
Data publikacji:
2001-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.-z
74.25.Gz
67.40.Db
Opis:
We study the evolution from BCS to Bose limit in a two-dimensional d-wave superconductor at zero temperature and low density of charge carriers within the mean-field theory. We examine single quasiparticle properties when particle density and attraction strength are varied. For sufficiently high interaction strength there is a critical density below which the system has a gap. The spectral and thermodynamic properties of the system do not evolve smoothly from the BCS-like to the Bose-like regime.
Źródło:
Acta Physica Polonica A; 2001, 99, 6; 691-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Urea/Formaldehyde/Rosa Canina sp. Seeds Composites
Autorzy:
Gürses, A.
Karagöz, S.
Mindivan, F.
Güneş, K.
Doğar, Ç.
Aktürk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194519.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Qk
Opis:
Urea-formaldehyde (UF) resin which is one of the most important wood adhesives is a polymeric condensation product of the chemical reaction of formaldehyde with urea, and considered as the most important type of adhesive resins for the production of particleboards. The present study is aimed to preparation and characterization of urea/formaldehyde/Rosa Canina sp. seeds - and urea/formaldehyde/ Rosa Canina sp. seeds/organo clay composites and also to determine the utility as an alternative and low cost material to manufacture particleboard. The synthesis of various composites was carried out using fresh Rosa Canina sp. seeds, typical agricultural waste, in its changing ratios from 7.7 to 83.3 wt%. Also, some of the composite mixtures were prepared by adding organo clay (0.17-3.3 wt%) in a constant ratio of 1/1 wt of urea and formaldehyde. The structural and mechanical characterization of samples was performed by X-ray diffraction, Fourier transform infrared spectra, high resolution transmission electron microscopy images and measurements of Shore D and scratch hardness. The analysis results conclude that organo clay platelets dispersed as simultaneously intercalated and exfoliated in resin matrix and also the increased organo clay ratio led to increase in the hardness values of samples.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 368-373
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Phenol/Urea/Formaldehyde and Clay Composites
Autorzy:
Doğar, Ç.
Gürses, A.
Köktepe, S.
Mindivan, F.
Güneş, K.
Aktürk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194842.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Qk
82.35.Gh
82.35.Lr
Opis:
Recently, so-called "phenol-formaldehyde-urea resins", which are generally made only by mechanical blending of UF resin and alkaline type PF resins, have been used as adhesives for the manufacturing of wood products. Faster curing PF resins can be also prepared by the addition of urea during or after the resin synthesis to yield co-condensed phenol-urea-formaldehyde (PUF) resins. In this study, resin/clay composites were prepared by in situ polymerization of phenol(18.2%)-urea(36.3%)-formaldehyde(45.5%) (PUF) with the various ratios of organoclay (7.69-45.45%) and colored organoclay (3.22-20.0%). The objective of our work is the investigation of the effect of addition of both organoclay and colored organoclay at different ratios on the textural characteristics. The composites are characterized by X-ray diffraction, Fourier transform infrared spectroscopy techniques and using high resolution transmission electron microscopy images of the samples. It was found that clay layers exfoliated in the resin matrix.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 374-378
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 88

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