MAGNETO-POLARONS IN A HARMONIC QUANTUM-DOT

We study cyclotron resonance of magnetopolarons in a harmonic quantum dot. The results show that for weak magnetic field (w(c) << W-LO), the cyclotron mass in a harmonic quantum dot is split into two cyclotron masses (m(+) and m*(-)). One (m*(+)) is larger than the bare band mas s for large quantum dots but is lower than the bare band mass for smal l quantum dots, and with decreasing the effective confinement length o f the quantum dot, the negative mass renormalization for the small qua ntum dots is important. The other (m(_)) is greater than the bare ban d mass and might be a measurable effect fbr the small quantum dots.