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Wyświetlanie 1-15 z 109
Tytuł:
Wigner Crystallization in InGaAs/InP Heterostructures with a Strong Disorder
Autorzy:
Kovács, Gy.
Remenyi, G.
Gombos, G.
Savel'ev, I. G.
Kreshchuk, A. M.
Hegman, N.
Pödör, B.
Powiązania:
https://bibliotekanauki.pl/articles/1933825.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
Non-linear current-voltage characteristics were observed in the range of filling factors of 0.3 ≤ v ≤ 0.4 in a two-dimensional electron system in InGaAs/InP heterostructures with a strong disorder. The observations are explained qualitatively in terms of magnetic field induced localization and Wigner solidification.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 783-786
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spontaneous Persistent Currents in Mesoscopic Rings
Autorzy:
Zipper, E.
Szopa, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931872.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
Persistent currents in mesoscopic systems made of a very clean metal and with nearly flat Fermi surface are studied. It is shown that the inclusion of the orbital magnetic interaction between electrons can lead to spontaneous currents (spontaneous fluxes) and to quantized flux trapping if the number of interacting electrons is large enough: The energy of the system is discussed and the self-consistent formulas for the spontaneous flux and for the quantized flux in the system is derived. The influence of the spin on the presented phenomena is discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 79-84
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical and Optical Characterization of Nanostructures
Autorzy:
Gornik, E.
Smoliner, J.
Rosskopf, V.
Powiązania:
https://bibliotekanauki.pl/articles/1931909.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
The characterization of nanostructures is a topic of vital interest, since the dimensions of commercially available semiconductor devices are now in a range, where quantum size effects become evident. In this paper, various methods are presented to characterize low-dimensional structures. Magnetic depopulation, tunneling, far infrared transmission, photo-conductivity and magnetophonon resonances are used to determine the low-dimensional sub-band energies. For each method, the special features are discussed and it is demonstrated that the different methods yield different, complementary information.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 119-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model of the Electron Transport in a Quantum Wire with Contacts
Autorzy:
Jungwirth, T.
Powiązania:
https://bibliotekanauki.pl/articles/1924221.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
A new model of the electron transport in a quantum wire with contacts is presented. The contact between the reservoir and the quantum past of the system is assumed to be lengthwise the ideal lead. The equilibrium state of electrons in the reservoir gives the final distribution of a non-equilibrium electron system in the ideal lead. The model enables a continuous quasi-1D description of the electron transport evoked by a difference of chemical potentials as well as by a difference of temperatures of reservoirs.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 882-886
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of Qubit in Multi-Electron Quantum Dot
Autorzy:
Jacak, L.
Krasnyj, J.
Jacak, D.
Salejda, W.
Mituś, A.
Powiązania:
https://bibliotekanauki.pl/articles/2024044.pdf
Data publikacji:
2001-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
The discussion of qubit for quantum computation in quantum dots technology is presented. The state-of-the-art structure of multi-electron dot is considered and the appropriate quasi-two-level system is suggested employing the singlet-triplet transition in the presence of magnetic field. The methods of qubit rotation (the write procedure) as well as two-qubit operations, as controlled-NOT, in vertically stacked dots system are analysed.
Źródło:
Acta Physica Polonica A; 2001, 99, 2; 277-291
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activated Transport in Magnetic-Field Induced Insulating Phase in Two-Dimensional Electron Gas in InGaAs/InP Heterostructures
Autorzy:
Pődör, B.
Gombos, G.
Reményi, G.
Kovács, Gy.
Savel'ev, I. G.
Novikov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/1968409.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
We report on experiments on low temperature (millikelvin range) activated magnetotransport on low-density two-dimensional electron systems in InGaAs/InP for Landau level filling factors 0.25 ≤ ν ≤ 0.55. The activation energy increases approximately linearly with decreasing filling factor. The observations are discussed in the light of the formation of the Wigner solid.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 945-949
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Subband-Landau Level Coupling in Systems with Anisotropic and Tilted Valleys
Autorzy:
Zalużny, M.
Okulski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1890833.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
The problem of the anticrossing of the Landau levels originating from the ground subband and first excited subband in the quasi-two-dimensional systems with anisotropic valleys in the presence of the tilted magnetic field is discussed in the framework of the perturbation theory. The full field coupling regime is considered. Comparison with the existing theoretical and experimental results is given.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 337-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation Energy and Electronic Structure of II-VI/IV Semiconductor Superlattices
Autorzy:
Jędrzejek, C.
Konior, J.
Kaprzyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1872700.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
We calculate formation energy and electronic structure of ultrathin (001)II-VI/IV semiconductor superlattices using the Korringa-Kohn-Rostoker all-electron method. Formation energies (∆H) are 2.18 eV for (Ge$\text{}_{2}$)$\text{}_{1}$(ZnSe)$\text{}_{1}$ and 1.50 eV for (ZnS)$\text{}_{1}$(Si$\text{}_{2}$)$\text{}_{1}$. The results of this work are significantly different from these by Ferraz and Srivastava who obtained ∆H = 0.88 eV for (001)(Ge$\text{}_{2}$)$\text{}_{1}$(ZnSe)$\text{}_{1}$ and moreover the one-layer super-lattices are metallic, which confirms the results by Ohno and Ito. The large formation energies surely lead to interfacial instability.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 349-352
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physics of Resonant Tunnelling
Autorzy:
Sheard, F. W.
Fromhold, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920955.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
A description is given of resonant tunnelling processes in double-barrier semiconductor heterostructures from the point of view of sequential theory. If a magnetic field is applied in the plane of the barrier interfaces, the energy and transverse momentum of the electrons injected into the quantum well through the emitter tunnel barrier can be varied independently by changing the applied voltage and magnetic field. This technique can be used to probe the energy and momentum spectrum of the subband states in a quantum well. In n-type wide-well structures, a detailed interpretation of magneto-oscillations in the tunnel current has been given in terms of semiclassical orbits of electrons in the well. In p-type structures with narrow wells, the dispersion curves of hole subbands, which are complicated by the strong mixing of light hole and heavy hole states, have been directly studied. Resonant tunnelling into the bound state of single donor atoms in a quantum well has recently been observed. The magnetic field dependence of the tunnel current then gives a measure of the transverse momentum distribution and hence lateral extent of the donor wave function.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 523-538
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interband Absorption in InGaAs/GaAs Quantum Well at High Hydrostatic Pressure
Autorzy:
Sosin, T. P.
Perlin, P.
Trzeciakowski, W.
Tober, R.
Powiązania:
https://bibliotekanauki.pl/articles/1929745.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
The interband absorption of strained InGaAs/GaAs multiple quantum well was studied at room temperature for pressures up to 5.5 GPa. Three absorption lines were attributed to the excitonic transitions hh1-e1, lh1-e1 and hh2-e2. They were visible until pressure of about 5 GPa which is above the Γ-X crossover for this system. Pressure coefficients of the observed lines were compared with the literature data. The origin of broadening of the lines above Γ-X crossover is discussed.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 749-752
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid State Quantum Interferometers (with and without the Warts)
Autorzy:
Washburn, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931867.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
A brief review of quantum interference in small conductors is followed by a discussion of quantum interference in ballistic conductors. The ballistic conductors are characterized by conservation of the momentum vector and this leads to a simple model for the details of the conductance of the system. In contrast, for diffusive conductors one can only predict the statistical behavior of the interference contributions to the conductance. The response of the ballistic interferometers is governed by semiclassical physics of the electron momentum states (i.e. the modes) in the quantum conductor. Under circumstances of reduced backscattering of the modes, the interference pattern appears to imitate that from a simple optical interferometer. New results from ballistic interferometers are reviewed briefly.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 57-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Many-Electron Effects in Low-Dimensional Semiconductor Structures
Autorzy:
Hawrylak, P.
Powiązania:
https://bibliotekanauki.pl/articles/1931870.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
Many-electron effects in low-dimensional semiconductor structures: quantum wells, wires, and dots are discussed. Three examples are given: (a) the quasi-particles of a Fermi liquid are illustrated with the calculation of the self-energy of a hot electron coupled to plasmons and optical phonons in modulation doped quantum wells, (b) the Fermi edge singularity and (c) the incompressible states of strongly correlated electrons in quantum dots tunable by applied magnetic field.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 67-77
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band Quantization in a Spherical Quantum Dot
Autorzy:
Buczko, R.
Powiązania:
https://bibliotekanauki.pl/articles/1923770.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
An analytical solution of the effective mass equation for a spherical valence band in cubic semiconductors is presented. The full degeneracy of the valence band, i.e. the light-hole, heavy-hole and spin-orbit split-off subbands, were taken into account. The analytical wave functions of the valence band were used for its quantization in a completely isolated (infinite potential barrier approximation) quantum dot. The dependence of discrete valence levels on the dot diameter is presented for the CuCl case.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 789-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Unified Approach to Interface and Confined Bulk Optical Phonons in Quantum Wells and Superlattices
Autorzy:
Röseler, J.
Suisky, D.
Powiązania:
https://bibliotekanauki.pl/articles/1924261.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
A unified description of confined optical LO, TO and interface phonons is given on the basis of vector "ghost" fields defined in the whole space. These fields are characterized by the relations for longitudinal and transversal fields. Real displacement fields are obtained by introducing confinement conditions. Interface charges and vortices appear due to this procedure.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 919-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground-State Structure of a Two-Electron Quantum Dot
Autorzy:
El-Said, M.
Powiązania:
https://bibliotekanauki.pl/articles/2014017.pdf
Data publikacji:
2000-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
The energy spectrum of two interacting electrons, confined in a parabolic quantum dot, presented in a magnetic field is obtained. We have analyzed the energy level crossings between spin-singlet and spin-triplet states. The influence of the quantum dot size on these crossings is also shown. The results of our calculations seem to be in good agreement with analytical and exact numerical data.
Źródło:
Acta Physica Polonica A; 2000, 97, 6; 1023-1032
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 109

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