Intersubband Transitions in Quantum-Well Heterostructures with Delta-Doped Barriers
Interim technical rept.,
WASHINGTON STATE UNIV PULLMAN
Pagination or Media Count:
A single quantum well doped by a negative delta-function potential Delta-potential in the barrier regions is analyzed in terms of the optical transitions in between subbands. The first two states of the quantum well do not change at all as a function of the strength of the delta-potential up to a certain value, whereas the third one gets lowered almost exponentially. An important point is that the delta-potential brings a state from the continuum to the bound region. There is a range of the strength of the delta-potential during which the transition energy from the first to second state decreases rapidly, and at a certain strength the first an second states disappear, and the third and fourth, which have been brought from the continuum, take their places. The oscillator strengths of the allowed transitions have a kind of oscillatory behavior in that range.
- Electricity and Magnetism