We study the procedure of miniband formation in CaN/lAIN constant-total-effective-radius multi-shell quantum dots （CTER-MSQDs） by calculating the subband energies. We find a different behavior of the miniband widths...We study the procedure of miniband formation in CaN/lAIN constant-total-effective-radius multi-shell quantum dots （CTER-MSQDs） by calculating the subband energies. We find a different behavior of the miniband widths and miniband gaps when the number of wells changes. It is shown that with increasing the inner quantum dot radiusRin, the number of minigaps decreases; with increasing the outer quantum dot radius Rout, the number of minigaps increases. We show that in the CTER-MSQDs systems, two kinds of minigaps exist： in the type （i） ones, minigaps increase monotonically when the number of wells increases while in the type （ii） ones, with increasing the number of wells, some of minigaps create, increase, at a critical number of wells decrease and finally vanish. Thus tuning of the m/nigaps and miniband widths in the CTER-MSQDs systems by using the number of wells, inner and outer quantum dot radii Rin and Rout is now possible.展开更多
基金Supported by the Iranian Nanotechnology Initiative Councilthe Shahrood University of Technology
文摘We study the procedure of miniband formation in CaN/lAIN constant-total-effective-radius multi-shell quantum dots （CTER-MSQDs） by calculating the subband energies. We find a different behavior of the miniband widths and miniband gaps when the number of wells changes. It is shown that with increasing the inner quantum dot radiusRin, the number of minigaps decreases; with increasing the outer quantum dot radius Rout, the number of minigaps increases. We show that in the CTER-MSQDs systems, two kinds of minigaps exist： in the type （i） ones, minigaps increase monotonically when the number of wells increases while in the type （ii） ones, with increasing the number of wells, some of minigaps create, increase, at a critical number of wells decrease and finally vanish. Thus tuning of the m/nigaps and miniband widths in the CTER-MSQDs systems by using the number of wells, inner and outer quantum dot radii Rin and Rout is now possible.
