We have observed a substantial blue shift of the
lowest energy transition in a composite double quantum well
made from materials with a type-TI band line-up. The pho
tocurrent measurements demonstrate a linear Stark shift due
to the separate confinement in real space for electrons and
holes. The charge separation is up to 45 Å in the strain bal
anced InAs0.42P0.58/Gao.67In0.33As samples. The low tem
perature photoluminescence reveals that an electric field of
only 30 kV/cm produces the blue shift of more than 25 meV.
All our measurements agree with the calculations within the
framework of Bir-Pikus strain Hamiltonian.
|Name||Springer Proceedings in Physics|
|Conference||25th International Conference on the Physics of Semiconductors, September 17-22, 2000, Osaka, Japan|
|Period||17/09/00 → 22/09/00|
|Other||25th Int. Conf. on the Physics of Semiconductors|