Abstract
We report the electric-field-induced ionisation, of both the negatively, X −, and the positively, X +, charged excitons in remotely doped GaAs quantum wells (QWs). The photoluminescence (PL) spectra demonstrate that the binding energy of the second confined electron (hole) is sharply reduced for X − (X +) by an electric field applied normal to the QW layers. Due to its larger spatial extent, X + ionises at lower electric fields than X −. The electric field dependence of the excited triplet state of X −, X − t, which becomes stable in an applied magnetic field, is also studied. We find X − t is less sensitive to ionisation by electric fields than the singlet state, X − s, in good agreement with calculations using a finite basis set of electron and hole Landau levels.
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