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1

Numerical Stability of Solution of Recursion Relation for Ideal Quantum Gases Containing Finite Number of Harmonically Trapped Particles

100%

Paszkiewicz T., Wolski S.

Acta Physica Polonica A

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2015

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vol. 128

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issue 2

204-207

EN

The numerical stability of the solution of recursion relation for mean occupation numbers derived by Schönhammer for ideal Fermi gas trapped in 1D harmonic potential is studied. In low temperature region there exists a solution of this recursion relation. In high temperature region the iteration becomes unstable. In low and high temperature regions with growing number of particles the region of numerical instability diminishes.

2

Response of Superconductor Bolometer to Phonon Fluxes

81%

Danilchenko B., Jasiukiewicz C., Paszkiewicz T., Wolski S.

Acta Physica Polonica A

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2003

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vol. 103

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issue 4

325-338

EN

A metallic film bolometer with heat capacity C is in contact with thermal bath and with crystalline specimen and is biased by a constant current I_b. The thermal contact of the bolometer is characterized by the thermal conductance G. The bolometer operates in the linear regime of dependence of resistance on temperature characterized by a constantα. Experiments which allow one to measureα, C, and G are proposed. The characteristic timeτ=C/G and characteristic current I_m=√{G/α} affect the effective relaxation rateΛ of the bolometer resistance R_b(t). The knowledge of the power W(t) absorbed by detector allows one to calculate R_b(t). The inverse problem of calculation of W(t) from known R_b(t) is also solved. The suitable algorithms are proposed. Deconvoluted absorbed power is obtained for experiments performed on GaAs and compared with phonoconductivity signal of two-dimensional electron gas structure as well as with results of Monte Carlo computer experiments.

3

Charge and Spin Transport in a Metal-Semiconductor Heterostructure with Double Schottky Barriers

61%

Wolski S., Jasiukiewicz C., Dugaev V., Barnaś J., Slobodskyy T., Hansen W.

Acta Physica Polonica A

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2015

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vol. 127

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issue 2

472-474

EN

Taking into account the available experimental results, we model the electronic properties and current-voltage characteristics of a ferromagnet-semiconductor junction. The Fe/GaAs interface is considered as a Fe/(i-GaAs)/n⁺-GaAs/n-GaAs multilayer structure with the Schottky barrier. We also calculate numerically the current-voltage characteristics of a double-Schottky-barrier structure Fe/GaAs/Fe, which are in agreement with available experimental data. For this structure, we have estimated the spin current in the GaAs layer, which characterizes spin injection from the ferromagnet to the semiconductor.

4

The Influence of Sonication and Silver Nanoparticles Doped on Viscoelastic Structure of Agarose Gel

42%

Żyła G., Stompor M., Kopańska M., Stagraczyński R., Fal J., Traciak J., Trybus M., Wolski S., Zawlik I., Cebulski J., Konefał-Janocha M., Cholewa M.

Acta Physica Polonica A

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2017

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vol. 132

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issue 1

152-154

EN

The paper presents result of experimental measurements of viscoelastic properties of agarose gel after sonication and with silver nanoparticles doped. Researches were conducted using a HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany), with serrated plate-plate measuring geometry. Viscoelastic properties of samples were measured with oscillation tests at constant deformation rate 0.1%, and frequency 1 Hz in the temperature range from 278 to 348 K. It was presented that using the sonication before solidification of gel results in increases of the storage modulus and complex viscosity of the solidified gel. It was also presented that when silver nanoparticles are doped into agarose gel, storage modulus and complex viscosity start to decrease at lower temperature.

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4 Acta Physica Polonica A

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2 Paszkiewicz T.

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1 Cholewa M.

1 Danilchenko B.

1 Dugaev V.

1 Fal J.

1 Hansen W.

1 Konefał-Janocha M.

1 Kopańska M.

1 Slobodskyy T.

1 Stagraczyński R.

1 Stompor M.

1 Traciak J.

1 Trybus M.

1 Zawlik I.

1 Żyła G.

Numerical Stability of Solution of Recursion Relation for Ideal Quantum Gases Containing Finite Number of Harmonically Trapped Particles

Response of Superconductor Bolometer to Phonon Fluxes

Charge and Spin Transport in a Metal-Semiconductor Heterostructure with Double Schottky Barriers

The Influence of Sonication and Silver Nanoparticles Doped on Viscoelastic Structure of Agarose Gel