Abstract:

The authors designed an asymmetric double quantum well structure with three subbands in the conduction band, and then calculated  energy values of the three subbands with the effective\|mass Schrodinger equation of confined electrons. In particular, the two adjacent excited subbands were correlated to  wave function due to the electronic tunneling effect. A weak probe field coupling the ground subband to the two excited subbands was found to have a double-peak absorption spectrum with an in-between transparency window. Applying a DC electric field on this double quantum well structure, one may easily change the ratio of dipole moments on the two probe transitions, and then effectively manipulate relative amplitudes of the two absorption peaks and the dispersion curve in the transparency window.

Key words: double quantum well structure, electronic tunneling effect, quantum correlation, transparency window, double\, peak absorption spectrum