Cyclotron resonance of magnetopolarons in a parabolic quantum dot in strong magnetic fields.

Abstract

Cyclotron resonance of magnetopolarons in a parabolic quantum dot with a strong magnetic field normal to the plane of the quantum dot is investigated theoretically. It is shown that for a strong magnetic field (${\mathrm{\ensuremath{\omega}}}_{\mathit{c}}$\ensuremath{\gg}${\mathrm{\ensuremath{\omega}}}_{\mathrm{LO}}$), the cyclotron mass in a parabolic quantum dot is split into two cyclotron masses (${\mathit{m}}_{+}^{\mathrm{*}}$ and ${\mathit{m}}_{\mathrm{\ensuremath{-}}}^{\mathrm{*}}$). One (${\mathit{m}}_{+}^{\mathrm{*}}$) is lower than the bare band mass, but increases with increasing effective confinement length of the quantum dot, and approaches that of the two-dimensional case. The other (${\mathit{m}}_{\mathrm{\ensuremath{-}}}^{\mathrm{*}}$) is greater than the bare band mass and might be a measurable effect for small quantum dots.