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Wyszukujesz frazę "Łepkowski, S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Pressure Dependence of the Light Emission in Zinc-Blende InGaAs/GaAs and InGaN/GaN Quantum Wells
Autorzy:
Łepkowski, S.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/1791301.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.D-
62.50.-p
81.40.Jj
78.67.De
Opis:
We present theoretical study of the pressure coefficient of the light emission $(dE_{E}/dP)$ in compressively strained zinc-blende InGaAs/GaAs and InGaN/GaN quantum wells, grown in a (001) direction. We investigate the contributions to $dE_{E}$/dP arising from (i) third-order (nonlinear) elasticity, (ii) nonlinear elasticity, originating from pressure dependence of elastic constants, and (iii) nonlinear dependence of elastic constants on composition in InGaAs and InGaN alloys. The obtained results indicate that the use of nonlinear elasticity is essential for determination of $dE_{E}$/dP in the strained InGaAs/GaAs and InGaN/GaN quantum wells, while the inclusion of the nonlinear dependence of elastic constants on composition of InGaAs and InGaN alloys does not improve agreement between the theoretical end experimental values of $dE_{E}$/dP in the considered structures.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 857-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poisson Ratio and Biaxial Relaxation Coefficient in $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ Alloys
Autorzy:
Łepkowski, S.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/1492915.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
61.43.Dq
81.40.Jj
Opis:
We present theoretical results showing dependence of Poisson ratio and biaxial relaxation coefficient on composition and atomic arrangement in wurtzite $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys. Our calculations reveal that the Poisson ratio determined for $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys subjected to a uniaxial stress parallel to the c axis of the wurtzite structure shows significant superlinear dependence on composition. The superlinear bowing in Poisson ratio is enlarged by the effect of In clustering. The biaxial relaxation coefficient determined for $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys subjected to a biaxial stress in the plane perpendicular to the c axis of the wurtzite structure changes superlinearly and linearly with x in $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$, respectively. The effect of In atom clustering results in sublinear dependence of the biaxial relaxation coefficient in both $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 902-904
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Elastic Properties of Wurtzite Al-Rich In$\text{}_{x}$Al$\text{}_{1 - x}$N Alloys
Autorzy:
Łepkowski, S. P.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/2048088.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
Opis:
We present theoretical study of lattice parameters and elastic constants of wurtzite Al-rich In$\text{}_{x}$Al$\text{}_{1 - x}$N (x = 0.125, 0.1875 and 0.25) alloys using self-consistent ab initio calculations with a supercell model. Two different atomic arrangements have been considered for a given x, by either distributing the In atoms as uniformly as possible over the supercell or by clustering the In atoms together in a small part of the supercell. Our calculations reveal that the a and c lattice parameters show almost linear dependence on composition for the alloys with uniform distribution of In atoms, while for the case of alloys with clustered In atoms the c lattice parameter deviates from linearity quite significantly. For the alloys with clustered In atoms, we observe that the values of C$\text{}_{11}$, C$\text{}_{12}$, and C$\text{}_{44}$ elastic constants are significantly smaller than the linear interpolated values between the elastic constants of AlN and InN, and the values of C$\text{}_{33}$ elastic constant are significantly larger than the corresponding interpolated values. For the alloys with uniform distribution of In atoms, only C$\text{}_{11}$ elastic constant deviates significantly from linear dependence on composition.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 666-668
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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