We estimate the spin relaxation rate due to spin-orbit coupling and acoustic phonon scattering in weakly confined quantum dots with up to five interacting electrons. The full configuration interaction approach is used to account for the interelectron repulsion, and Rashba and Dresselhaus spin-orbit couplings are exactly diagonalized. We show that electron-electron interaction strongly affects spin-orbit admixture in the sample. Consequently, relaxation rates strongly depend on the number of carriers confined in the dot. We identify the mechanisms which may lead to improved spin stability in few electron (> 2) quantum dots as compared to the usual one and two electron devices. Finally, we discuss recent experiments on triplet-singlet transitions in GaAs dots subject to external magnetic fields. Our simulations are in good agreement with the experimental findings, and support the interpretation of the observed spin relaxation as being due to spin-orbit coupling assisted by acoustic phonon emission.

Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots / J. I., Climente; Bertoni, Andrea; Goldoni, Guido; Rontani, Massimo; Molinari, Elisa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 76:(2007), pp. 1-11. [10.1103/PhysRevB.76.085305]

Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots

BERTONI, Andrea;GOLDONI, Guido;RONTANI, Massimo;MOLINARI, Elisa
2007

Abstract

We estimate the spin relaxation rate due to spin-orbit coupling and acoustic phonon scattering in weakly confined quantum dots with up to five interacting electrons. The full configuration interaction approach is used to account for the interelectron repulsion, and Rashba and Dresselhaus spin-orbit couplings are exactly diagonalized. We show that electron-electron interaction strongly affects spin-orbit admixture in the sample. Consequently, relaxation rates strongly depend on the number of carriers confined in the dot. We identify the mechanisms which may lead to improved spin stability in few electron (> 2) quantum dots as compared to the usual one and two electron devices. Finally, we discuss recent experiments on triplet-singlet transitions in GaAs dots subject to external magnetic fields. Our simulations are in good agreement with the experimental findings, and support the interpretation of the observed spin relaxation as being due to spin-orbit coupling assisted by acoustic phonon emission.
76
1
11
Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots / J. I., Climente; Bertoni, Andrea; Goldoni, Guido; Rontani, Massimo; Molinari, Elisa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 76:(2007), pp. 1-11. [10.1103/PhysRevB.76.085305]
J. I., Climente; Bertoni, Andrea; Goldoni, Guido; Rontani, Massimo; Molinari, Elisa
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/597862
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