Abstract
The fine structure of the heavy-hole exciton in CdSe quantum dots grown on ZnSe by molecular beam epitaxy is studied. The application of a tilted magnetic field allows us to observe all four levels of the ground state simultaneously. The zero-field separation between the optically forbidden and allowed doublets ranges between 1.7 and 1.9 meV and is markedly reduced due to the existence of a wetting layer and the finite energy barrier at the hetero-interface. The energy splitting within the allowed doublet (200 μeV) is substantially larger than for the forbidden states (⩽20 μeV), proving that a dominant contribution arises from the long-ranged part of the electron–hole exchange interaction. The total set of g-factors is derived. A huge anisotropy for the electron is found.
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