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Spin splitting and precession in quantum dots with spin-orbit coupling: The role of spatial deformation

AuthorsValín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç
Keywords[PACS] Quantum dots
[PACS] Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
Issue Date18-Mar-2004
PublisherAmerican Physical Society
CitationPhysical Review B 69(8): 085306 (1-7) (2004)
AbstractExtending a previous work on spin precession in GaAs/AlGaAs quantum dots with spin-orbit coupling, we study the role of deformation in the external confinement. Small elliptical deformations are enough to alter the precessional characteristics at low magnetic fields. We obtain approximate expressions for the modified g factor including weak Rashba and Dresselhaus spin-orbit terms. For more intense couplings numerical calculations are performed. We also study the influence of the magnetic field orientation on the spin splitting and the related anisotropy of the g factor. Spin-orbit coupling effects can reproduce the experimental spin-splittings reported by Hanson et al. [Phys. Rev. Lett. 91, 196802 (2003)] for a one-electron dot. For dots containing more electrons, Coulomb interaction effects are estimated within the local-spin-density approximation, showing that many features of the non-iteracting system are qualitatively preserved.
Description7 pages, 8 figures.-- PACS nr.: 73.21.La.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0305648
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.69.085306
Appears in Collections:(IFISC) Artículos
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