RESONANT SHALLOW DONOR MAGNETOPOLARON EFFECT IN A GAAS ALGAAS QUANTUM-DOT IN HIGH MAGNETIC-FIELDS/

Resonant shallow donor magnetopolaron effect in a GaAs/AlGaAs quantum dot in high magnetic fields is investigated by the variational treatme nt. It is shown that both the cyclotron resonant frequency omegac+ du e to the 1s-p+ hydrogenic transition and the cyclotron resonant freque ncy omegac- due to the 1s-p- hydrogenic transition increase with the decrease of the dot size. The cyclotron resonant frequency omegac+ is always larger than the bulk LO-phonon frequency omega(LO), while the cyclotron resonant frequency omegac- is lower than omega(LO) for larg er quantum dots. The results also show that Coulomb interaction effect on the resonant frequencies is significant.