Magnetotunnelling spectroscopy of electron statesin a quantum well incorporating self-assembledquantum dots in magnetic fields up to 28 T

摘要

We have studied magneto-oscillations of the tunnelling current through a quantumwell incorporating InAs self-assembled quantum dots in magnetic fields up to 28 T appliednormal to the QW plane. We find evidence for the strong modification of the Landau levels inthe host GaAs quantum well in the presence of dots embedded in the centre of the well, whichwe attribute to resonant interaction between GaAs LO phonons and high index Landau levels,I.e. magnetopolaron effects.