Symmetry-induced hole-spin mixing in quantum dot molecules
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Altres documents de l'autoria: Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I.
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Títol
Symmetry-induced hole-spin mixing in quantum dot moleculesData de publicació
2015Editor
American Physical SocietyISSN
2469-9950; 2469-9969Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.041302Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
We investigate theoretically the spin purity of single holes confined in vertically coupled GaAs/AlGaAs
quantum dots (QDs) under longitudinal magnetic fields. A unique behavior is observed for triangular QDs,
by ... [+]
We investigate theoretically the spin purity of single holes confined in vertically coupled GaAs/AlGaAs
quantum dots (QDs) under longitudinal magnetic fields. A unique behavior is observed for triangular QDs,
by which the spin is largely pure when the hole is in one of the dots, but it becomes strongly mixed when
an electric field is used to drive it into molecular resonance. The spin admixture is due to the valence-band
spin-orbit interaction, which is greatly enhanced in C3h symmetry environments. The strong yet reversible
electrical control of hole spin suggests that molecules with C3-symmetry QDs, like those obtained with [111]
growth, can outperform the usual C2-symmetry QDs obtained with [001] growth for the development of scalable
qubit architectures. [-]
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PHYSICAL REVIEW B 92, 041302(R) (2015)Drets d'accés
©2015 American Physical Society
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