Crystal phase quantum dots are formed during the nanowire growth by vertically stacking distinct crystal phases of the same chemical compound. In this Letter we show, using an atomistic many-body approach, that InP crystal phase quantum dots may exhibit a peculiar and rare antibonding hole ground state. Interestingly, even small strains due to a wurtzite–zinc-blende lattice mismatch—which is often neglected—can strongly affect the properties of the lowest hole states, resulting in unusual double-peak features in the excitonic optical spectra.

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• Crystal structure
• Excitons
• Double quantum dots
• Quantum dots
• Tight-binding model