Spin-Spin Interaction In Artificial Molecules With In-Plane Magnetic Field
Devis Bellucci, Massimo Rontani, Guido Goldoni, Filippo Troiani, Elisa Molinari
Abstract
We investigate theoretically the spin-spin interaction of two-electrons in vertically coupled QDs as a function of the angle between magnetic field and growth axis. Our numerical approach is based on a real-space description of single-particle states in realistic samples and exact diagonalization of carrier-carrier Coulomb interaction. In particular, the effect of the in-plane field component on tunneling and, therefore, spin-spin interaction will be discussed; the singlet-triplet phase diagram as a function of the field strength and direction is drawn.
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