Effects of magnetic field and geometrical size on the interband light absorption in a quantum pseudodot system

We study in this paper the direct interband transitions in quantum pseudodot system under the influence of an external magnetic field. We obtain the analytical expressions for the light interband absorption coefficient and threshold frequency of absorption as the functions of applied magnetic field and geometrical size of quantum pseudodot system. We study the absorption threshold frequency (ATF) at small and high applied magnetic field and also as a function of size of quantum pseudodot. According to the results obtained from the present work, we find that (i) the ATF is linear at large magnetic field. (ii) It is nonlinear at small magnetic field. (iii) The ATF depends on the geometrical size of quantum pseudodot and decreases when the size of quantum pseudodot increases. Therefore, the magnetic field and quantum pseudodot size play important roles in the ATF. (C) 2010 Elsevier Masson SAS. All rights reserved.