Study of transmission properties in GaAs/Al_xGa_(1-x)As superlattices generated by a specific sequences

摘要

In this work, we have numerically examined the transmission properties across Monomer Height Barrier Superlattices (MHBSLs), Dimer Height Barrier Superlattices (DHBSLs) and Trimer Height Barrier Superlattices (THBSLs) using the exact Airy function formalism and the transfer-matrix method. We have observed the formation of minigaps. We have demonstrated that the number of these minigaps is identical to the number the height barriers potential V_2 "n" introduce in the ordered structure according to the sequence: S_i=S_(i-1)+(n +1) where: S_1 = 2; i=1, 2, 3, 4... and n = monomer, dimer, trimer, quatemer.... Their widths present a linear variation with the applied bias and increases linearly with increasing of the difference between the heights of the potential barriers V_1 and V_2.