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Wyszukujesz frazę "Kovács, G." wg kryterium: Autor

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    Tytuł:
    An Icosahedral Quasicrystal as a Packing of Regular Tetrahedra
    Autorzy:
    Fang, F.
    Kovacs, J.
    Sadler, G.
    Irwin, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202974.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    61.46.-w
    Opis:
    We present the construction of a dense, quasicrystalline packing of regular tetrahedra with icosahedral symmetry. This quasicrystalline packing was achieved through two independent approaches. The first approach originates in the Elser-Sloane 4D quasicrystal. A 3D slice of the quasicrystal contains a few types of prototiles. An initial structure is obtained by decorating these prototiles with tetrahedra. This initial structure is then modified using the Elser-Sloane quasicrystal itself as a guide. The second approach proceeds by decorating the prolate and oblate rhombohedra in a 3-dimensional Ammann tiling. The resulting quasicrystal has a packing density of 59.783%. We also show a variant of the quasicrystal that has just 10 "plane classes" (compared with the 190 of the original), defined as the total number of distinct orientations of the planes in which the faces of the tetrahedra are contained. This small number of plane classes was achieved by a certain "golden rotation" of the tetrahedra.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 458-460
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Magnetotransport in InGaAs/InP at High Magnetic Fields and Low Temperatures
    Autorzy:
    Kovacs, Gy.
    Novikov, V.
    Gombos, G.
    Podor, B.
    Remenyi, Gy.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876235.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    Opis:
    Quantum Hall effect and Shubnikov-de Haas effect measurements were made in two-dimensional electron gas in liquid phase epitaxially grown Ga$\text{}_{0.47}$In$\text{}_{0.53}$As/InP heterostructures in high magnetic fields in the temperature range from 4.2 K down to 60 mK. Two-dimensional electron gas concentrations and mobilities were in the range of (1 - 3) × 10$\text{}^{11}$ cm$\text{}^{-2}$ and (1 - 3) × 10$\text{}^{4}$ cm$\text{}^{2}$/(V s), respectively. Corresponding to this the i = 1 quantum Hall effect plateau occurred at about 6 T magnetic field. Although fractional occupation numbers of about 0.3 were reached, no signs of fractional quantization were detected. Both current and frequency breakdown of the quantum Hall effect were investigated. Narrowing of the plateaus with increasing current differs from that measured in GaAs/AlGaAs structures because of the different mechanisms of dissipation. The fact that the magnetic length becomes smaller than the characteristic scale of the disorder seems to be essential in understanding the low frequency breakdown via the presence of quasi-classical electron states.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 473-476
    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:
    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:
    Energy Relaxation in Two-Dimensional Electron GaS in InGaAs/InP via Electron-Acoustic Phonon Interaction
    Autorzy:
    Kreshchuk, A. M.
    Novikov, S. V.
    Savel'ev, I. G.
    Polyanskaya, T. A.
    Pődör, B.
    Reményi, G.
    Kovács, Gy.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991650.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.-i
    Opis:
    The energy relaxation in two-dimensional electron gas in In$\text{}_{0.53}$Ga$\text{}_{0.47}$As/InP has been studied in a wide range of electron temperatures (from 0.1 to 10 K). The energy loss rate of electrons is controlled by the interaction of electrons with the piezoelectric potential of acoustic phonons. The value of the piezoelectric constant for InGaAs lattice-matched to InP is deduced from theoretical fits of the experimental data: h$\text{}_{14}$=(1.1±0.1)×10$\text{}^{7}$ V/cm. Available data for the piezoelectric constant of In$\text{}_{x}$Ga$\text{}_{1-x}$As are discussed in the light of the results of this work.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 415-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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