Browsing by Author "Demirel, A.I."

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High Frequency Energy Radiation of N-Type Semiconductors at Constant Electric and Magnetic Field
(2013) Hasanov, E.R.; Panahov, A.Z.; Demirel, A.I.
The aim of this study is investigation of some properties of n-type doped semiconductors. Compound semiconductors having minimum points more than one, radiate high frequency energies in electric and magnetic fields at the certain values of them. Depending of the electric and magnetic field values, high frequency energy radiation states have been studied theoretically in this work. © 2013 Eladar Rasuloglu Hasanov et al.
Instability in Semiconductors With Deep Traps in the Presence of Strong (Μ ± H>>c) External Magnetic Field
(2011) Hasanov, E.R.; Hosseyn, P.N.; Panahov, A.Z.; Demirel, A.I.
The unstable wave in semiconductors with certain deep traps in the presence of external constant electric and strong magnetic fields has been theoretically investigated. The wave frequency and increment are found. The interval of magnetic field and critical value of electric field of the instability appearance have been determined.
A Local-Pair Mechanism for High-Temperature Superconductivity at the Di -And Trivalent Sites
(2000) Wilson, J.A.; Demirel, A.I.
The p/d hybridization that primarily characterizes copper leads to local moments, lacking of the pair-breaking variety, both at di-and trivalent sites. Support for the negative-U model is extracted from the author's earlier work on the metal-insulator transition. A more magnetically oriented model, like the resonant valence band model which we have recently associated with our observations in d1 TiOCl etc., does not really seem suited to the geometry and electronic conditions in the copper oxides present. However it is suggested that TiB2, La3S4 and the Chevrel phases might be open to treatment by such a model. Comment it also made about how the superconductivity of PdHcursive Greek chi and Ba(Pb/Bi)O3 might be seen in the light of the present model, and attention is directed once again to what might be happening in the pressure-quenched CuCl and CdS.
The Peculiarities of the Electrical and Thermo Electrical Properties of P-Type Ag2te
(1999) Demirel, A.I.; Aliev, S.A.; Aliev, F.F.; Guseynov, F.Z.; Orak, S.
The electrical and thermoelectrical properties of p-type Ag2Te have been investigated. Various peculiarities were observed: the minimum (at T≈65 K) and maximum (at T≈200 K) on the temperature dependence of conductivity σ(T); the weak dependence of Hall coefficient R(T) (in 200-300 K range) and the maximum (at T≈100 K and 250 K) on the temperature dependence of thermal power α0(T). The investigation results were interpreted by two-bands model. It is shown that mentioned peculiarities have been stimulated by the narrow gap of Ag2Te and its temperature dependence.
Radiations of Electron-Type Conductivity Environments in Elecrtric and Magnetic Field
(2012) Demirel, A.I.; Hasanov, E.R.; Panahov, A.Z.
It has firstly been shown that, in electron-type conductivity environments declined waves occur depending on the environment. Internal and external declined waves frequencies have been calculated. It has been proven that, the amplitudes of the occurring waves depend on the time as exponential form.
Ultrahigh Frequency Generation in Gaas-Type Two-Valley Semiconductors
(2009) Hasanov, E.R.; Gasimova, R.K.; Panahov, A.Z.; Demirel, A.I.
It is theoretically shown that in GaAs-type two-valley semiconductors in the certain interval of an external magnetic field an unstable wave is appeared. The frequency and increment of this wave are determined. The amplitude and frequency of the oscillations are calculated.