MAGNETICALLY TUNED WIDE-BAND QUANTUM-WELL INFRARED PHOTODETECTORS

The electron eigenstates of double quantum well system in an in-plane magnetic field are calculated accurately using the density-functional theory which includes the Coulomb interaction between electrons. The a bsorption coefficient as a function of the probe photon energy is furt her calculated using the self-consistent-held theory which takes into account many-body effects on the optical intersubband transitions. The dependence of the absorption spectra on the magnetic field, temperatu re, electron density, well and middle-barrier widths, quantum-well sym metry, and electric field has been studied extensively. It provides an unconventional approach for designing a tunable wide-band quantum wel l infrared photodetector by applying an in-plane magnetic field.