Wednesday, June 26, 2013

1306.5889 (Vahram L. Grigoryan et al.)

Dynamical spin-spin coupling of quantum dots    [PDF]

Vahram L. Grigoryan, Jiang Xiao
We carried out a nested Schrieffer-Wolff transformation of an Anderson two-impurity Hamiltonian to study the spin-spin coupling between two dynamical quantum dots under the influence of rotating transverse magnetic field. As a result of the rotating field, we predict a novel Ising type spin-spin coupling mechanism between quantum dots, whose strength is tunable via the magnitude of the rotating field. Due to its dynamical origin, this new coupling mechanism is qualitatively different from the all existing static couplings such as RKKY, while the strength could be comparable to the strength of the RKKY coupling.
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