2006/01/31 by Vitaly N. Golovach, Massoud Borhani, Daniel Loss · 2 citations
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.74.165319
published as Phys. Rev. B, 74, 165319 (2006) · 11 pages, 1 figure, extended version of v1
arxiv created 2006/08/27 · arxiv updated 2009/12/01
An alternating electric field, applied to a quantum dot, couples to the electron spin via the spin-orbit interaction. We analyze different types of spin-orbit coupling known in the literature and find two efficient mechanisms of spin control in quantum dots. The linear in momentum Dresselhaus and Rashba spin-orbit couplings give rise to a fully transverse effective magnetic field in the presence of a Zeeman splitting at lowest order in the spin-orbit interaction. The cubic in momentum Dresselhaus terms are efficient in a quantum dot with non-harmonic confining potential and give rise to a spin-electric coupling proportional to the orbital magnetic field. We derive an effective spin Hamiltonian, which can be used to implement spin manipulation on a timescale of 10 \rm ns with the current experimental setups.