MAGNETIC-FIELD EFFECTS ON STRONG-COUPLING POLARONS IN QUANTUM DOTS

Magnetic field effects on strong-coupling polarons in a parabolic quan tum dot are investigated by the Landau-Pekar variational treatment. Th e polaron binding energy and the average number of virtual phonons aro und the electron as functions of the magnetic field strength and the e ffective confinement length of the quantum dot are obtained in the Gau ssian function approximation. It is shown that in the presence of magn etic fields, the polaron binding energy increases with the enhancement of the magnetic field strength. The magnetic field effects on the ave rage number of virtual phonons around the electron are very small for strong electron-LO-phonon coupling.