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1
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Conductance Modulation in Semiconductor Microstructure with Periodic Array of Micromagnets

100%
Tralle I.
Acta Physica Polonica A
|
1998
|
vol. 94
|
issue 3
603-610
EN
A simple theory for the Aharonov-Bohm-like effect (dynamical phase) in semiconductor microstructure, is presented in a paper, assuming a "ballistic spin transport". If in one of the arms of microstructure there is an additional periodic magnetic field, the spin wave function acquires a phase shift due to additional spin precession about that field. By introducing quaternion representation of the elements of propagation matrices, one can calculate the transition coefficient of the structure. It is shown that the deep modulation of the conductance could be achieved.
2
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Optoelectronic Device Based on Gunn Effect Extended Diode Structure

100%
Tralle I.
Acta Physica Polonica A
|
2007
|
vol. 111
|
issue 6
835-846
EN
We discuss the possibility of light control by means of light diffraction by space charge waves which are the periodic domain trains induced at some circumstances in GaAs Gunn effect diode. The two possible regimes of the proposed device are considered: the first one which is analogous to the Bragg diffraction in case of light-acoustic diffraction and the other one, which we call "intermediate", since the parameter Q which distinguishes the Raman-Nath (Q<1) and the Bragg diffraction (Q>10), in this case is≈1 (actually, only bit smaller than 1). Among the advantages of this hypothetical device are the simpler control of operation and perhaps, possibility to couple it with the waveguides and switchers for surface electromagnetic waves and other miniaturized photonic circuits.
3
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Undulator-Like Radiation and Cooperative Phenomenon in Semiconductor Microstructure with Grating

64%
Tralle I., Zięba P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
522-526
EN
In the article the cooperative N^2-effect is considered, that is the radiation whose power is ım N^2, where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effect is the result of combining two other effects, Gunn-effect in GaAs and undulator-like radiation which can be produced by means of microstructure with grating (microundulator). It is very probable that the effect can be used for the developing of a new semiconductor-based room temperature source of the THz radiation.
4
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Undulator-Like Radiation and N² Effects in Semiconductor Microstructures with Grating

64%
Tralle I., Zięba P.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 2
228-230
EN
In the article the cooperative N²-effects are considered, that is the radiation whose power is ım N², where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effects are the result of combining two effects: the Gunn-effect in GaAs and undulator-like radiation, or "pumping wave" acting on the electrons and which is the result of undulator field, while the second is the backward effect of radiation which is produced by electrons moving within such microundulator. It is very probable that the effects can be used for the developing of a new semiconductor-based room temperature source of the THz-radiation.
5
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Photogalvanic Effect in Semiparabolic Quantum Well

51%
Majchrowski K., Paśko W., Tralle I.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 5
854-856
EN
In this work we studied the charge carriers behaviour in quantum structures where the symmetry with respect to space coordinates and time-reversal symmetry are broken simultaneously. As the model of such structures we considered finite semiparabolic quantum well (we considered earlier the case of triangular QW) placed in external magnetic field. We have shown by numerical analysis that the energy spectra of charge carriers in such structures are anisotropic with respect to in-plane (transverse) motion ϵ_{n}( + k_{x}) ≠ ϵ_{n}(-k_{x}). This leads to the anisotropy of charge carriers in-plane momentum transfer which, in its turn leads to the anisotropy of photoconductivity σ( + k_{x}) ≠ σ(-k_{x}) and as it follows from our calculations, the effect though not very great, could be measurable for the magnetic field of about few T.
6
Content available remote

New Type of Composite Gyrotropic Metamaterial

51%
Paśko W., Zięba P., Tralle I., Çoruh A.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 1
121-123
EN
In this work we examined the possibility of fabricating the metamaterial in a relatively simple way. Our idea was to use the three-component mixture of ingredients, where one of them is responsible for the negative permeability μ(ω) of hypothetical metamaterial, while the other two cause the negative value of effective permittivity ε(ω). In our previous work, we considered Hg_{1-x}Cd_xTe semiconductor compound as one of the ingredients of mixture. As fabrication of the Hg_{1-x}Cd_xTe is related to using mercury which is very poisoning, we tried to exclude this material. In the work we proved by numerical simulations the possibility of substituting mercury cadmium telluride by Pb_{1-x}Sn_xTe. We have shown by computer simulations that by the proper fitting of the parameters, e.g. the radius of nanoparticles, their magnetic moments, the relative concentration of ingredients, etc., it is possible to obtain the metamaterial with negative refraction index in a relatively broad range of temperatures and magnetic fields. The last seems to be very promising in terms of practical applications of metamaterials.
7
Content available remote

Qubits in Double Quantum Well Structure

51%
Jakubczyk P., Majchrowski K., Tralle I.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 1
115-117
EN
We propose a new approach to producing the qubits in electron ballistic transport in low-dimensional structures such as double quantum wells or double quantum wires. Next, we examine the possibility to produce quantum entanglement in the framework of the Jaynes-Cummings model and shown that at least in principle, the entanglement can be achieved due to series of "revivals" and "collapses" in the population inversion due to the interaction of a quantized single-mode EM-field with a two-level system.
8
Content available remote

Exciton Binding Energy and Oscillator Strength in a Shallow Quantum Well in an External Magnetic Field

51%
Zięba P., Piętka B., Łusakowski J., Tralle I.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
237-239
EN
We discuss the influence of an external magnetic field on the exciton energy and the exciton oscillator strength in the shallow quantum wells. We include into consideration the Coulomb attraction between electron and hole, which is rarely taken into account. We self-consistently solve the Schrödinger equation to compare the obtained results with the experimental values.
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