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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:43 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Solid State Physics and Materials Science, Optics, Spectroscopy, Plasma and Lasers
Title:
Influence of pressure and temperature on the magneto-optical properties and Aharonov-Bohm oscillations of a quantum ring
Authors:
Doina Bejan (1)
Affiliation:
1) University of Bucharest, Faculty of Physics
E-mail
doinitabejan@yahoo.com
Keywords:
quantum ring, magnetic field, pressure, temperature, Aharonov-Bohm oscillations
Abstract:
We theoretically investigated the influence of pressure and temperature on the electronic and optical properties of a GaAs /Al0.3Ga0.7As quantum ring, described by a combination of a parabolic potential and an inverse square one, in the presence of the magnetic field. The results reveal a variation with pressure and temperature of the ring radiuses but also of the period of Aharonov-Bohm oscillations appearing in the electronic spectra in magnetic field. This period varies nonlinearly with pressure and temperature, increasing with pressure but decreasing with temperature raise while the ring radiuses decrease unevenly with pressure and increase with temperature. In the paper we also studied the variation of absorption and refractive index with pressure at three values of magnetic field. We found that with the increment of the magnetic field or of the pressure more transitions are allowed. When no external pressure is applied, the absorption maxima shift to lower energies at increasing magnetic field, but with increasing pressure, the absorption maxima red-shift at intermediate magnetic fields and blue-shift at high fields.
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