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Wyświetlanie 1-15 z 48
Tytuł:
Voltage Controlled Terahertz Transmission Enhancement through GaN Quantum Wells
Autorzy:
Laurent, T.
Sharma, R.
Torres, J.
Nouvel, P.
Blin, S.
Chusseau, L.
Palermo, C.
Varani, L.
Cordier, Y.
Chmielowska, M.
Faurie, J.
Beaumont, B.
Shiktorov, P.
Starikov, E.
Gruzinskis, V.
Powiązania:
https://bibliotekanauki.pl/articles/1505459.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
78.67.De
73.21.Fg
Opis:
We report transmission measurements of GaN quantum well grown on sapphire substrate in the 220-325 GHz frequency band at low temperatures. A significant enhancement of the transmitted beam intensity with the applied voltage on the devices under test is found.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 107-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Nature of Potential Fluctuations in the MBE CdTe/CdMgTe Quantum Well in a Magnetic Field: Experiment and Theory
Autorzy:
Szot, M.
Karpierz, K.
Avetisyan, A. A.
Djotyan, A. P.
Kossut, J.
Grynberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047014.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
72.15.Rn
72.80.Ey
73.21.Fg
Opis:
Far infrared photoconductivity spectra of CdTe/Cd$\text{}_{0.8}$Mg$\text{}_{0.2}$Te quantum well uniformly n-type doped with iodine in barriers and in the well were investigated as a function of the magnetic field. The spectra were recorded for several fixed far infrared photon energies and peaks corresponding to intra donor transitions were observed. The magnetic field at which the peaks were observed was the same for all far infrared photon energies used. This is interpreted as an evidence of the presence of fluctuations of the electrostatic potential - quantum dots which reduce the dimensionality of the potential in which a shallow donor is placed. A characteristic size of the fluctuations was found to be of 23-25 nm and 30-40 nm. Theoretical calculations show a nonmonotonic dependence of the electron binding energy on the donor centre in such quantum dot, as a function of magnetic field. This explains why the position of experimentally observed peak is insensitive to far infrared photon energy used. Temperature evolution of spectra and the theoretical model proposed, indicate similarities between fluctuations in the two-dimensional structure investigated and fluctuations in bulk systems.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 379-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Magneto-Optical Response of Diluted Magnetic Semiconductor $CdTe-Cd_{1-x}Mn_{x}Te$ Multi Quantum Wells in the Voigt Configuration
Autorzy:
Hidari, M.
Farjami Shayesteh, S.
Powiązania:
https://bibliotekanauki.pl/articles/1807790.pdf
Data publikacji:
2009-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
78.30.-j
78.20.Ls
73.21.Fg
Opis:
We have calculated the s- and p-polarized far infrared magnetoplasmon spectra of doped $CdTe-Cd_{1-x}Mn_{x}Te$ multi quantum wells in the presence of a static magnetic field up to 20 T parallel to the surface of the layers using a macroscopic model based on effective medium theory, using a novel approach which gives a good account of the data together with a clear physical interpretation of the various spectral features, such as the free carrier and optical phonon properties. The results show that the transverse optical modes (for the whole composition range, x = 0 to 1) are sensitive and change linearly with respect to the composition parameter. In p-polarized reflectivity the cyclotron resonance experiences a blue shift when the magnetic field strength increases. Also, the analysis of the dielectric tensor function and the Voigt dielectric function is used to determine the carriers' cyclotron effective masses (for both holes and electrons) as a function of composition. Furthermore, a modified random element iso-displacement approach has been extended for the multi layers to analyze the influence of the composition on the optical phonon response in the barrier layer.
Źródło:
Acta Physica Polonica A; 2009, 116, 2; 232-237
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Radiation Induced Spin Photocurrents in Non-Magnetic Low Dimensional Structures
Autorzy:
Ganichev, S. D.
Prettl, W.
Powiązania:
https://bibliotekanauki.pl/articles/2043707.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
72.25.Fe
78.67.-n
73.21.Fg
Opis:
Spin photocurrents generated by homogeneous excitation with terahertz radiation in low dimensional structures are reviewed. Three microscopic mechanisms are responsible for the occurrence of an electric current linked to a uniform spin polarization in a quantum well, the circular photogalvanic effect, the spin-galvanic effect and the magneto-gyrotropic effect. These phenomena provide several methods to investigate various spin properties in low dimensional structures like details of band structure and spin relaxation time.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 581-608
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Luminescence and Absorption under Impurity Breakdown in Quantum Wells and Strained Semiconductor Layers
Autorzy:
Vorobjev, L.
Firsov, D.
Shalygin, V.
Panevin, V.
Sofronov, A.
Ustinov, V.
Zhukov, A.
Egorov, A.
Andrianov, A.
Zakhar'in, A.
Ganichev, S.
Danilov, S.
Kozlov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813218.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.Fg
71.55.-i
71.55.Eq
73.21.Fg
73.61.Ey
78.55.Cr
78.66.-w
78.67.De
Opis:
We present the results of THz luminescence investigations in structures with Si-doped quantum wells and Be-doped GaAsN layers under strong lateral electric field. The peculiar property of these structures is the presence of resonant impurity states which arise due to dimensional quantization in quantum wells and due to built-in strain in GaAsN epilayers. The experimentally obtained THz emission spectra consist of the lines attributed to intra-center electron transitions between resonant and localized impurity states and to the electron transitions involving the subband states. Absorption of THz radiation and its temperature dependence was also studied in structure with tunnel-coupled quantum wells at equilibrium conditions and under electric field.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 925-928
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Exciton and Trion States in CdTe Quantum Well at High Magnetic Fields
Autorzy:
Andronikov, D.
Platonov, A.
Crooker, S.
Barrick, T.
Karczewski, G.
Kochereshko, V.
Powiązania:
https://bibliotekanauki.pl/articles/2043711.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Ji
73.21.Fg
78.55.Et
78.67.De
Opis:
Temperature dependent photoluminescence and reflectivity spectra of excitons, singlet and triplet states of trions were studied in CdTe-based quantum wells at high magnetic fields. Interesting features of the exciton and trion spectral lines with altering temperatures are explained by analyzing the thermal population and the kinetics of the exciton-electron-trion energetic system.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 653-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stimulated Emission from the MBE Grown Homoepitaxial InGaN Based Multiple Quantum Wells Structures
Autorzy:
Ivanov, V.
Godlewski, M.
Miasojedovas, S.
Juršėnas, S.
Kazlauskas, K.
Žukauskas, A.
Skierbiszewski, C.
Siekacz, M.
Leszczyński, M.
Perlin, P.
Suski, T.
Grzegory, I.
Powiązania:
https://bibliotekanauki.pl/articles/1179597.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
73.21.Fg
72.20.Jv
78.47.+p
Opis:
We report on photoluminescence characterization of InGaN based laser structures grown by homoepitaxial radio frequency plasma-assisted molecular beam epitaxy. Owing to Si doped barriers, the structures show a negligible impact of the built-in electric field, which was proved by excitation intensity dependent and quantum well width dependent luminescence experiments. Relatively low variation in band potential due to inhomogeneous distribution of In was quantitatively estimated from the photoluminescence temperature behavior using Monte Carlo simulation of in-plane carrier hopping and optically detected cyclotron resonance experiments. Efficient stimulated emission with a low threshold for optically pumped laser structures was observed.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 225-229
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Precession of Quasi-Bound States in Heterostructures with Spin-Orbit Interaction
Autorzy:
Isić, G.
Indjin, D.
Ikonić, Z.
Milanović, V.
Radovanović, J.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/1791209.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ej
73.20.At
73.21.Fg
Opis:
We use a finite-difference model that is capable of describing the single state spin dynamics in a double-barrier AlGaAs heterostructure. The use of Green's functions enables a description of the double-barrier structure by a finite matrix while the interaction with contacts is described by appropriate self-energies. To account for interface roughness scattering, a self-energy $Σp_{IR}$(E, k) is derived within the random phase approximation. The dominant part is due to in-plane momentum relaxation while a smaller part describing spin-flip scattering is neglected. The former only decreases the state lifetime while the latter can also affect the spin precession frequency.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 513-515
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skyrmions in a Hole Gas with Large Spin Gap and Strong Disorder
Autorzy:
Bryja, L.
Ryczko, K.
Wójs, A.
Misiewicz, J.
Potemski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2046907.pdf
Data publikacji:
2006-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Mf
73.21.Fg
78.20.Ls
78.67.De
Opis:
In the photoluminescence excitation spectra of two-dimensional valence holes with large spin gap and strong disorder we find evidence for quantum Hall ferromagnetism and small skyrmions around the Landau level filling factorν=1. This interpretation is supported by numerical calculations.
Źródło:
Acta Physica Polonica A; 2006, 110, 2; 163-168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shake-Up Processes in Photoluminescence of Two-Dimensional Holes in a High Magnetic Field
Autorzy:
Wójs, A.
Bryja, L.
Misiewicz, J.
Potemski, M.
Reuter, D.
Wieck, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047047.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Cc
71.35.Ji
73.21.Fg
Opis:
Recombination of excitons and positive trions is studied by two-beam photoluminescence of a two-dimensional hole gas in a high magnetic field. The singlet, dark-triplet and bright-triplet states of a free trion are resolved, and their binding energies are determined. Recombination of acceptor-bound trions is also detected, including a low-energy cyclotron replica, corresponding to a hole shake-up process. Identification of all these different transitions was possible by analysis of optical selection rules and the comparison of experimental spectra with realistic numerical calculations.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 429-435
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of Elastic Waves in a Quasi-One-Dimensional Cavity: Theory and Experiment
Autorzy:
Báez, G.
Cobián-Suárez, M.
Martínez-Argüello, A.
Martínez-Mares, M.
Méndez-Sánchez, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399047.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.Cd
62.30.+d
03.65.Nk
73.21.Fg
Opis:
We study the scattering of torsional waves through a quasi-one-dimensional cavity both from the experimental and theoretical points of view. The experiment consists of an elastic rod with square cross-section. In order to form a cavity, a notch at a certain distance of one end of the rod was grooved. To absorb the waves, at the other side of the rod, a wedge, covered by an absorbing foam, was machined. In the theoretical description, the scattering matrix S of the torsional waves was obtained. The distribution of S is given by Poisson's kernel. The theoretical predictions show an excellent agreement with the experimental results. This experiment corresponds, in quantum mechanics, to the scattering by a delta potential, in one dimension, located at a certain distance from an impenetrable wall.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 1069-1073
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Room Temperature Carrier Kinetics in the W-type GaInAsSb/InAs/AlSb Quantum Well Structure Emitting in Mid-Infrared Spectral Range
Autorzy:
Syperek, M.
Ryczko, K.
Dallner, M.
Dyksik, M.
Motyka, M.
Kamp, M.
Höfling, S.
Misiewicz, J.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1398579.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Fg
78.47.D-
78.30.Fs
78.47.jg
78.55.Cr
78.67.De
Opis:
Room temperature carrier kinetics has been investigated in the type-II W-design $AlSb//InAs//Ga_{0.80}In_{0.20}As_{0.15}Sb_{0.85}//InAs//AlSb$ quantum well emitting in the mid-infrared spectral range (at 2.54 μ m). A time-resolved reflectance technique, employing the non-degenerated pump-probe scheme, has been used as a main experimental tool. Based on that, a primary carrier relaxation time of 2.3±0.2 ps has been found, and attributed to the initial carrier cooling process within the quantum well states, while going towards the ground state via the carrier-optical phonon scattering mechanism. The decay of a quasi-equilibrium carrier population at the quantum well ground states is primarily governed by two relaxation channels: (i) radiative recombination within distribution of spatially separated electrons and holes that occurs in the nanosecond time scale, and (ii) the hole tunnelling out of its confining potential, characterized by a 240±10 ps time constant.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1224-1228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Particle Localization by Disorder in ν = 5/2 Fractional Quantum Hall State and Its Potential Application
Autorzy:
Goswami, P.
Powiązania:
https://bibliotekanauki.pl/articles/1418290.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Fg
Opis:
We consider the filling factor 5/2 fractional quantum Hall state of spin-polarized fermions in a dirty (mobility $μ_b \lt 10 m^2 V^{-1} s^{-1}$) bi-layer quantum well system.We show that the system undergoes a quantum phase transition from the effective two-component state to an effective single-component state, at fixed charge imbalance regulatory parameter $\Delta_{c}$ and constant layer separation, as the inter-layer tunneling strength $\Desta_\text{SAS}$ is increased. At finite and constant $\Delta_\text{SAS}$, a transition from the latter state to the former state is also possible upon increasing the parameter $\Delta_{c}$. We identify the order parameter to describe quantum phase transition as a pseudo-spin component and calculate this with the aid of the Matsubara propagators in the finite-temperature formalism. Our treatment is able to show that, at low temperature(< 0.1 K) and low value of charge imbalance regulatory parameter, there is a competition between the disorder and the inter-layer tunneling strength in the sample. The competition leads to the quasi-particle localization at low tunneling strength.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 741-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Cascade Laser Design for Tunable Output at Characteristic Wavelengths in the Mid-Infrared Spectral Range
Autorzy:
Daničić, A.
Radovanović, J.
Milanović, V.
Indjin, D.
Ikonić, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1537879.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
73.21.Fg
Opis:
We present a method for systematic optimization of quantum cascade laser active region, based on the use of the genetic algorithm. The method aims at obtaining a gain-maximized structure, designed to emit radiation at specified wavelengths suitable for direct absorption by pollutant gasses present in the ambient air. After the initial optimization stage, we introduce a strong external magnetic field to tune the laser output properties and to slightly modify the emission wavelength to match the absorption lines of additional compounds. The magnetic field is applied perpendicularly to the epitaxial layers, thus causing two-dimensional continuous energy subbands to split into series of discrete Landau levels. This affects all the relevant relaxation processes in the structure and consequently the lifetime of carriers in the upper laser level. Furthermore, strong effects of band nonparabolicity result in subtle changes of the lasing wavelength at magnetic fields which maximize the gain, thus providing a path for fine-tuning of the output radiation properties. Numerical results are presented for GaAs/$Al_{x}Ga_{1-x}As$ based quantum cascade laser structures designed to emit at particular wavelengths in the mid-infrared part of the spectrum.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 772-776
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polaron Effects on Nonlinear Optical Properties of a Hydrogenic Impurity in a CdTe/ZnTe Quantum Dot
Autorzy:
Azhagu Parvathi, A.
John Peter, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399298.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Fg
42.65.An
71.38.-k
Opis:
Hydrogenic donor impurity binding energy is obtained in a $Zn_{x}Cd_{1-x}Te//ZnTe$ strained quantum dot taking into account the phonon confinement effect. The interaction of the electron and the phonon modes are expressed in terms of the Fröhlich interaction Hamiltonian. The binding energy is obtained for various Zn composition using the Aldrich-Bajaj effective potential. Calculations have been obtained using the Bessel function as an orthonormal basis for different confinement potentials of barrier height considering the internal electric field induced by the spontaneous and piezoelectric polarizations. Polaron induced linear and third-order nonlinear optical absorption coefficients and the changes of refractive index as a function of incident photon energy are observed. Our results coincide with the recent observations of a hydrogenic impurity binding energy in a CdTe/ZnTe quantum dot solved analytically. It is observed that the potential taking into account the effects of phonon makes the hydrogenic binding energies larger than the obtained results using a Coulomb potential screened by a static dielectric constant and the optical properties of hydrogenic impurity in a quantum dot are strongly affected by the confining potential and the quantum size. It is found that the geometry of the quantum dot, zinc concentration and the effect of phonon have a great influence on the absorption coefficient and refractive index changes of the dot. It is also observed that the magnitude of the absorption coefficients enhances with the inclusion of phonon effect.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 706-712
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 48

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