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1
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Resonant Transmission in Effective-Mass "Double-Barrier" System

100%
Riesz F.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
505-507
EN
The transmission characteristic of barrierless ABABA multilayer sys­tem, where A and B are materials with differing effective masses, is ana­lyzed. The system shows resonant transmission similarly to a conventional double-barrier system, but shows unique features: unity transmission at zero energy, a more structured nature of the transmission versus energy curve and a non-decreasing peak-to-valley ratio with increasing energy.
2
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Hopping Conduction Mechanism in Amorphous CuO-Bi_{2}O_{3} Pellets

100%
Motke S. G., Burghate D. K., Gawande W. J., Pakade S. V., Yawale S. P.
Acta Physica Polonica A
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1994
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vol. 86
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issue 6
969-978
EN
The transport properties of CuO-Bi_{2}O_{3} pellets (pressed at room temperature 303 K) like dc electrical conductivity etc. are measured. The activation energy, dielectric constant etc. are reported. The hopping conduction is examined. Non-adiabatic hopping conduction is observed. The plot of -log σ versus 1/T is found to be linear. Activation energy of pellets containing CuO (80, 70, 60 mol%) shows electronic conduction while the pellet containing CuO (50 mol%) shows ionic conduction. The effect of content of CuO (mol%) and frequency on dielectric constant is also studied. The variation of dielectric constant with CuO (mol%) shows zigzag nature and may be due to the relaxation effects.
3
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Excitation of Electron Wave Packets in Low-Dimensional Semiconductor Structures by Inhomogeneous Light Pulses

100%
Král P., Mašek J.
Acta Physica Polonica A
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1992
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vol. 82
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issue 4
697-701
EN
Generation of electron wave packets by space inhomogeneous light pulses is studied in low-dimensional semiconductor systems. Examination of their free propagation for ultrashort times as well as in the stationary excitation regime is performed. Non-classical effects related to the inhomogeneity of the source are predicted.
4
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Complex Impedance Investigation of Epitaxial LCMO Thin Films

80%
Mateev E., Nurgaliev T., Blagoev B.
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vol. 126
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issue 3
787-790
EN
Epitaxial La_{0.67}Ca_{.33}MnO_3 (LCMO) thin films by off-axis magnetron sputtering were deposited on SrTiO_3 (STO) substrates. Complex impedance measurements (module and phase of the thin film impedance) in frequency range 1-30 kHz are done. Substantial dependence of both: module and phase of the complex surface impedance is observed. The temperature interval scanned is from 77 K to room temperature. The impedance has inductive behavior for temperatures less than the Curie temperature and capacitive for higher temperatures. Reduction of the film thickness from 60 to 30 nm shifts the impedance curves to the lower temperatures.
5
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On the 2D Quantum Tunneling

51%
Mohammadpour H.
Acta Physica Polonica A
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2016
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vol. 130
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issue 3
769-772
EN
In this paper, we have solved a quantum tunneling problem for 2-dimensional systems, including electron gas and graphene. In spite of the one-dimensional scattering problems, in two dimensions, we observe phenomenon of tunneling at energies above the barrier. This effect is an analogue to the total internal reflection in optics. The scattering amplitudes inside the barrier region exhibit decaying behavior corresponding to optical evanescent-wave coupling, not only in energies below barrier height, but also above barrier. Velocity-selecting transmission, corresponding to angle-resolved beam filtering effect is one of the achievements of the paper. The famous Hartman effect which occurs normally at sub-barrier energies and has previously been studied for graphene is also addressed. The results manifest occurrence of the Hartman effect for over-barrier energies, as well.
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