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Spin-orbit coupling and magnetic spin states in cylindrical quantum dots

  • C. F. Destefani (a1) (a2), Sergio E. Ulloa (a1) and G. E. Marques (a2)

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We make a detailed analysis of each possible spin-orbit coupling of zincblende narrow-gap cylindrical quantum dots built in a two-dimensional electron gas. These couplings are related to both bulk (Dresselhaus) and structure (Rashba) inversion asymmetries. We study the competition between electron-electron and spin-orbit interactions on electronic properties of 2-electron quantum dots.

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1 Datta, S., and Das, B., Appl. Phys. Lett. 56, 665 (1990).
2 Bychkov, Y.A., and Rashba, E.I., J. Phys. C 17, 6039 (1984).
3 Loss, D., and DiVincenzo, D.P., Phys. Rev. A 57,120 (1998); X.Hu, and S.Das Sarma, Phys.Rev. A 64, 042312 (2001).
4 Dresselhaus, G., Phys. Rev. 100, 580 (1955).
5 Jacak, L., Wojs, A., and Hawrylak, P., Quantum Dots (Springer, Berlin, 1998).
6 Destefani, C.F., Ulloa, S.E., and Marques, G.E., Phys. Rev. B 69, 125302 (2004); C.F. Destefani, Ph.D. Thesis at Universidade Federal de São Carlos, São Paulo, Brazil, unpublished.
7 InSb parameters: m = 0.014 m0, g = −51, ε = 16.5, aB = 625 Å, α = 500 Å2, γ = 160 eVÅ3. Dot characteristics: ћω0 = 15 meV (l0 = 190 Å), z0 = 40 Å, dV/dz = −0.5 meV/Å. Prefactors (meV) at zero B-field: = αћω0/= 0.2, ER = −(α/λ)dV/dz = 1.3, = γ/λ3 = 0.02, = γ/λ = 5.2, and Eee = αћλ/αβ= 4.5.
8 Darnhofer, T., and Rössler, U., Phys. Rev. B 47, 16020 (1993).

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