Symmetry-induced hole-spin mixing in quantum dot molecules
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Otros documentos de la autoría: Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I.
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Título
Symmetry-induced hole-spin mixing in quantum dot moleculesFecha de publicación
2015Editor
American Physical SocietyISSN
2469-9950; 2469-9969Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.041302Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
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)Derechos de acceso
©2015 American Physical Society
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