Spin Fine Structure in Optically Excited Quantum Dot Molecules

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  • 10 July 2006
Abstract
The interaction between spins in coupled quantum dots is revealed in distinct fine structure patterns in the measured optical spectra of InAs double quantum dot molecules containing zero, one, or two excess holes. The fine structure is explained well in terms of a unique molecular interplay of spin exchange interactions, Pauli exclusion and orbital tunneling. This knowledge is critical for converting quantum dot molecule tunneling into a means of optically coupling not just orbitals, but spins.

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