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Wyszukujesz frazę "Bednarek, S." wg kryterium: Wszystkie pola

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    Tytuł:
    New Donor State of S Symmetry
    Autorzy:
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929769.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    The influence of the short-range potential and the electron-phonon coupling on the donor spectrum is discussed. It is shown that the attractive short-range potential leads to a formation of a single additional state of s symmetry and with energy lying below a weakly perturbed hydrogen-like spectrum, which includes the 1s level. The new state can be called the 0s state. With decreasing short-range attraction, the energy of this state increases crossing over the hydrogen-like levels and, for weak short-range potential, the 0s state disappears. If the electron-phonon coupling is sufficiently strong, the donor hydrogen-like spectrum is perturbed only in a very narrow region of the leve1 crossing.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 820-822
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared Absorption on Shallow Donors in CdF$\text{}_{2}$
    Autorzy:
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887164.pdf
    Data publikacji:
    1991-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    A theoretical description of shallow donor absorption spectra in CdF$\text{}_{2}$ in the infrared region is given. The properties of the stable (Y) and bistable (In) donors are analyzed and quantatively described. It is shown that the bistability of donors and the shape of the infrared absorption band have the same origin, which is the combined effect of electron-LO-phonon coupling, conduction band non-parabolicity and short-range central-cell potential.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 2-3; 393-396
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conduction Band Influence on the Properties of Bistable Donors
    Autorzy:
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890880.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    A theoretical description of bistable donors in polar semiconductors is proposed. The donor states are described within the one-band approximation, which takes into account a finite width and nonparabolicity of the conduction band. The interaction between the defect and the crystal lattice is assumed in the Fröhlich form. For the bistable indium impurity in cadmium fluoride, a coexistence of strongly and weakly localized donor states has been obtained. The calculated energies for both the states and absorption band shape in the 3-eV range are in agreement with experiment.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 357-360
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anion-Cation Site Dependence of Pressure Coefficients for Donors in GaAs
    Autorzy:
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933711.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    The theoretical model, based on the many-band approach, is proposed for the strongly localized donor states in GaAs. The pressure coefficients for the states of A$\text{}_{1}$ and Τ-2 symmetry have been calculated for the donors at the anion and cation sites. The obtained results show that these pressure coefficients are different from the conduction-band pressure coefficients and are dependent on the lattice site occupied by the impurity as well as on the symmetry of the donor states.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 671-674
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metastable One- and Two-Electron donor States in GaAs and CdF$\text{}_{2}$
    Autorzy:
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1947315.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    The strongly localized one-electron (D$\text{}^{0}$) and two-electron (D¯) donor states are considered with the lattice deformation around the donor center taken into account. For GaAs, the donor energy levels have been calculated as functions of the hydrostatic pressure. The calculated energy positions and pressure coefficients agree with the experimental data. It is shown that the interaction with phonons reduces the probability of radiative transitions between the states of different localization and leads to the metastability of shallow-level donor states with respect to the D¯ state in GaAs and both the states (D$\text{}^{0}$ and D¯) in CdF$\text{}_{2}$.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 719-722
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Electron Spin Operations Employed for Logical Gates of Quantum Computer
    Autorzy:
    Bednarek, S.
    Dudek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807642.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.63.Nm
    03.67.Lx
    05.45.Yv
    Opis:
    Electron localized in a quantum dot in the vicinity of conductor surface, causes an induced potential to appear. This potential enables self-focusing of electron wave function. Because of this feature, in a planar nanostructure consisting of a quantum well covered with a layer of an insulator, on top of which metal electrodes are deposited, formation of induced dots and quantum wires is possible. By applying appropriate voltages to the electrodes, it is feasible to transport an electron in a fully controllable way in a form of a stable wave packet between two specific locations in a nanodevice. While transporting an electron along properly shaped closed loops, spin-orbit coupling intrinsically present in a semiconductor nanostructure can be employed to perform operations on an electron spin.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-7-S-12
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Description of Shell Filling in Cylindrical Quantum Dots
    Autorzy:
    Szafran, B.
    Bednarek, S.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992210.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    Opis:
    A theoretical quantitative description is given for non-periodic oscillations observed in a current vs. gate voltage characteristics of cylindrical quantum dots. Energy eigenvalues and chemical potentials for a system of N confined electrons (N=1,...,13) are calculated by the unrestricted Hartree-Fock method with a confinement potential proportional to the gate voltage. The positions of the observed peaks of the current are reproduced with a very good accuracy. The non-periodicity of the characteristic is explained as a result of the shell filling, which is a signature of the quantum Coulomb blockade.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 555-559
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and Capacitance Spectroscopy of Quantum Dots
    Autorzy:
    Adamowski, J.
    Bednarek, S.
    Szafran, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027454.pdf
    Data publikacji:
    2001-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    73.63.-b
    Opis:
    A review of recent theoretical studies on a single-electron tunneling in quantum dots is presented. This effect underlies the transport spectroscopy performed on the vertical gated quantum dots and the capacitance spectroscopy on the self-assembled quantum dots. The conditions of the single-electron tunneling are formulated in terms of electrochemical potentials of the electrons in the leads and in the quantum dot. The electrochemical potentials for the electrons confined in the quantum dots can be calculated by solving the many-electron Schrödinger equation. The results obtained by the Hartree-Fock method are presented. For the vertical gated quantum dot, the realistic confinement potential is obtained from the Poisson equation. The application of the self-consistent procedure to the solution of the Poisson-Schrödinger problem is discussed. The calculated positions of the current peaks at zero bias and boundaries of the Coulomb diamonds for non-zero bias are in good agreement with experiment. The influence of an external magnetic field on the single-electron tunneling is also discussed. The spin-orbital configurations of the electrons confined in the quantum dots change with the magnetic field, which leads to features observed in the current-voltage and capacitance-voltage characteristics.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 2; 145-163
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Pairs and Excitons in Quasi-One-Dimensional Nanostructures
    Autorzy:
    Bednarek, S.
    Szafran, B.
    Chwiej, T.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036023.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.-b
    Opis:
    A theoretical study of two-particle systems in quasi-one-dimensional quantum wires and quantum dots is presented. We have derived the analytical formula for the effective interaction potential between the charge carriers confined laterally by a strong parabolic potential and applied this formula to electron pairs in single and double quantum dots and to excitons in quantum wires. In the single quantum dot of the sufficiently large size, we have found the Wigner-type localization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 567-572
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanodevice for High Precision Readout of Electron Spin
    Autorzy:
    Szumniak, P.
    Bednarek, S.
    Szafran, B.
    Grynkiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048078.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.63.Nm
    03.67.Lx
    05.45.Yv
    Opis:
    In this paper we propose and simulate operation of a nanodevice, which enables the electron spin accumulation and very precise read-out of its final value. We exploit the dependence of the electron trajectory on its spin state due to the spin-orbit coupling in order to distinguish between different spin orientations.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 651-653
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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