Spin Fine Structure in Optically Excited Quantum Dot Molecules

Details Spin Fine Structure in Optically Excited Quantum Dot Molecules Spin Fine Structure in Optically Excited Quantum Dot Molecules

2006-07-10

arxiv.org/abs/cond-mat/0607241v4

Phys. Rev. B 75, 245318 (2007) (9 pages)

Physics

Condensed Matter

Other Condensed Matter

10 pages, 7 figures, added material, (published)

Scientific paper

10.1103/PhysRevB.75.245318

The interaction between spins in coupled quantum dots is revealed in distinct fine structure patterns in the measured optical spectra of InAs/GaAs double quantum dot molecules containing zero, one, or two excess holes. The fine structure is explained well in terms of a uniquely 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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