Influence of external fields on the exciton binding energy and interband absorption in a double inverse parabolic quantum well
Abstract
Ground-state binding energy and optical absorption coefficient of exciton in a symmetric double inverse
parabolic quantum well system in the presence of external electric and magnetic fields are investigated
theoretically. Numerical calculations have been carried out with the variational technique considering the
single-band effective mass approximations. Results reveal that the excitonic binding energy and interband
optical absorption depend on significantly on the geometrical and structural parameters defining carriers’
double inverse parabolic confinement potential, the aluminum concentration at the well center, the electric
field, and the magnetic field. The exciton binding energy is a decreasing (increasing) function of the electric
field (magnetic field). The increase in aluminum concentration creates a blueshift at the resonance peak
positions. As a result, the tunability of the excitonic effects is expected to be of importance in developing
stable and high-efficiency nanoscale excitonic optoelectronic devices.