Suppression of charge transfer by spin symmetry and the Pauli exclusion principle. For a double quantum dot, a singlet state can enter the lowest singlet, whereas a triplet state is blocked if the required triplet lies above the accessible energy window. Spin mixing or relaxation can lift blockade.
A resonantly driven local electron-spin rotation can give a blocked two-dot triplet a singlet component, allowing spin-conserving charge transfer to a lowest-orbital doubly occupied dot. A common rotation of two perfectly identical spins does not mix singlet and triplet sectors, so relative spin rotation or an additional mixing mechanism is essential. Leakage-current spectroscopy tests resonant lifting; pulse-duration oscillations add evidence for coherent control.

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  1. Spin-to-charge conversion
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