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Quantum dots (QDs) can act as convenient hosts of two-level quantum szstems,such as single electron spins, hole spins or excitons (bound electron-holepairs). Due to quantum confinement, the ground state of a single hole confinedin a QD usually has dominant heavy-hole (HH) character. For this reasonlight-hole (LH) states have been largely neglected, despite the fact that mayenable the realilzation of coherent photon-to-spin converters or allow forfaster spin manipulation compared to HH states. In this work, we use tensilestrains larger than 0.3% to switch the ground state of excitons confined inhigh quality GaAs/AlGaAs QDs from the conventional HH- to LH-type. TheLH-exciton fine structure is characterized by two in-plane-polarized lines and,~400 micro-eV above them, by an additional line with pronounced out-of-planeoscillator strength, consistent with theoretical predictions based on atomisticempirical pseudopotential calculations and a simple mesoscopic model.

Semiconductor quantum dots with light-hole exciton ground state: fabrication and fine structure