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Spintronics, quantum computing and quantum communication science utilizingcubic semiconductors rely largely on the properties of the hole states,composed of light and heavy hole wavefunction components. The admixture oflight-hole (LH) into ground hole state predominately by the heavy hole (HH)would induce unique features of LH in optical transitions, spin relaxation, andspin polarization. We point to an unexpected source of HH-LH mixing in quantumdots, arguing that in contrast with current models the mixing does not reflectthe strain between the dot and its matrix and does not scale inversely with theenergy splitting between the bulk HH and LH states. Instead, we show viaatomistic pseudopotential calculations on a range of strained and unstraineddots of different symmetries that the HH-LH mixing is enabled by the presencein the QD of a dense ladder of intermediate states between the HH and LH stateswhich amplifies and propagates this interaction and leads to "supercoupling"(analogous to super-exchange in magnetism). This explains a number ofoutstanding puzzles regarding the surprising large coupling seen in unstrainedQD (GaAs/AlAs) of ideal shapes and the surprising fact that in strained QD(InAs/GaAs) the coupling is very strong despite the fact that the 12-foldincrease in bulk HH-LH splitting overrides the ~4 fold enhancement of thecoupling matrix element by strain in comparison with unstrained GaAs QDs.

Supercoupling between heavy-hole and light-hole states in self-assembled quantum dots