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1
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Phonon Images of Crystals for Different Sources

100%
Jasiukiewicz C., Paszkiewicz T.
Acta Physica Polonica A
|
1993
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vol. 84
|
issue 3
459-473
EN
The focusing patterns for energy and quasi-momentum are obtained for different types of phonon sources. We considered point and extended (Gaussian) sources and sources of monochromatic and Planckian phonons.
2
Content available remote

Magnetic Field Dependence of Phonon-Induced Drag Current of 2D Carriers

81%
Lehmann D., Jasiukiewicz C., Paszkiewicz T.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 5
891-894
EN
The magnetic field dependence of the drag current induced by beams of acoustic phonons is studied in a 2D gas of carriers, formed in a heterostructure. This drag current is related to the velocity of the center of mass of the gas. The elimination of the degrees of freedom related to the relative motion of the carriers leads to a Langevin equation for the center-of-mass position vector. From this equation one can obtain an expression for the induced current density which depends on carrier density-density correlation functions. An explicit formula for the time-integrated current density is derived taking into account all intra and inter Landau level transitions. Corresponding numerical results are in good agreement with the experimental patterns.
3
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Phonon Induced Drag of Charge Carriers in Heterostructures in Magnetic Fields: Limit of Weak Fields

81%
Jasiukiewicz C., Lehmann D., Paszkiewicz T.
Acta Physica Polonica A
|
1996
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vol. 90
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issue 4
829-832
EN
The response of a 2D gas of charge carriers of mobility μ in magnetic field B to pulsed phonon beams is considered. Previously we derived a quantum Langevin equation for the centre-of-mass of the carrier gas, which allows us to calculate the time integrated drag current. This formula is studied in the weak magnetic field limit. When the ratio of the cyclotron frequency ω_{c} to the frequency ω of phonons is small and μB ≪ 1, the general formula coincides with the corresponding expression obtained in the frame of the Boltzmann equation with the collision integral independent of B.
4
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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.
5
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Images of the Response Signal of a 2D Gas of Carriers to a Pulsed Beam of 3D Phonons

81%
Jasiukiewicz C., Lehmann D., Paszkiewicz T.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 4
661-664
EN
The patterns for the time integrated drag current induced by a pulsed beam of bulk phonons in a 2D gas of charge carriers are calculated. A beam of Planckian phonons propagates in a GaAs crystal. We considered a 2D gas of electrons lying in a {001} plane and a 2D gas of holes lying in the {311} plane. Planckian phonons are radiated by an extended (Gaussian) source.
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