Symmetry-induced hole-spin mixing in quantum dot molecules
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Other documents of the author: Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I.
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comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Title
Symmetry-induced hole-spin mixing in quantum dot moleculesDate
2015Publisher
American Physical SocietyISSN
2469-9950; 2469-9969Type
info:eu-repo/semantics/articlePublisher version
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.041302Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
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)Rights
©2015 American Physical Society
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