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- 저자 : Talbi A. (검색결과 2 건)
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Magnetic properties of exciton trapped by an off-center ionized donor in single quantum dot
Bosch J.,Talbi A.,Baskoutas S.,Feddi E. 한국물리학회 2021 Current Applied Physics Vol.23 No.-
It is known that the lines of exciton (X) and exciton trapped by an ionized donor (D+, X) are often very close which makes very difficult their experimental identification. In order to facilitate their distinction in spherical quantum dots, we investigate the effect of an applied magnetic field studying the binding energy of the complex (D+, X) as function of dot size and the ionized donor position. Our calculation is using a variational approach taking into account the interactions between all charge carriers. Our results show that the complex is more sensitive to the magnetic field than the exciton and that the energy of the exciton is not sufficiently affected when the ionized donor is placed at the edge of the quantum dot. Finally our results are in a fairly good agreement with experimental data and can predict the behaviour law of the diamagnetic effect relating to (D+, X).
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Zimou J.,Nouneh K.,Talbi A.,El Gana L.,Hsissou R.,El Habib A.,Ahmoum H.,Briche S.,El Jouad Z.,Beraich M.,Addou M. 한국물리학회 2021 Current Applied Physics Vol.31 No.-
Undoped and Ni-doped thin films of cerium dioxide have been deposited by spray pyrolysis technique on the glass substrate at the optimized temperature (450 ± 5) ◦C. Thin films Ce1-xNixO2 doped by different concentrations of Ni was characterized by X-ray diffraction. Raman analysis showed a peak at 461 ± 1 cm 1 position for the undoped film, which corresponds to the active mode (F2g mode) of the cubic fluorite structure. SEM images showed that the particles have a uniform spherical shape. EDS data have confirmed all elements (Ce, Ni and O) existence. Optical properties of samples show a decrease in band gap energy with increasing the nickel rate. Cyclic voltammetry indicates that the storage capacity of samples increases as the Ni rate increases. The EIS of CeO2/ITO electrodes displays a small semicircular at high frequency. The theoretical results obtained using WIEN2k match well with the experimental ones.
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