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Numerical investigation of digitised parabolic quantum wells for terahertz AlGaAs/GaAs structures

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4 Author(s)
Reeder, R. ; Dept. of Electron., TTU, Tallinn ; Udal, A. ; Velmre, E. ; Harrison, P.

The calculations of quasi-parabolic quantum wells (QW) with smooth and digitised potential distributions on GaAs/Al0.42Ga0.58As system for 1 divide 7 THz frequencies are accomplished by numerical 1D Schrodinger equation solvers. It is shown that for energy eigenvalues equal spacing in smooth QWs the 18% quartic addition to parabolic potential is needed to compensate the electron effective mass increase in AlxGa1 - xAs as x rarr 0.42. The optimisation of digitised multibarrier distributions revealed existence of two types of optimal solutions. At that the second type with periodically filled centre yielded low rms-deviations below 5% for energy spacings in frequency range 4 divide 7 THz. For frequencies below 2 THz the accuracy of digitised approach became insufficient to guarantee reasonably equally spaced energy levels

Published in:

Baltic Electronics Conference, 2006 International

Date of Conference:

2-4 Oct. 2006