Effect of an applied electric field on electronic subbands in [formula omitted] double quantum wells

Abstract

The influence of an electric field on the electronic subbands in In 0.53 Ga 0.47 As In 0.52 Al 0.48 As coupled double quantum wells has been investigated theoretically. The electronic subband energies and the wave-functions in In 0.53 Ga 0.47 As In 0.52 Al 0.48 As coupled double quantum wells under an applied electric field are calculated by the transfer matrix method. When an electric field is applied to a coupled quantum well, the intersubband transition energies are shifted by a large amount. Also, the shifts of the absorption peaks are much more sensitive to the electric field than in the single quantum well case. The coupling of the electronic subband energies in the two In 0.53 Ga 0.47 As In 0.52 Al 0.48 As quantum wells leads to an enhancement of the quantum-confined Stark effect. These results indicate that In 0.53 Ga 0.47 As In 0.52 Al 0.48 AS coupled quantum wells have attractive applications to new kinds of optical modulation devices.