Coulomb interactions induced perfect spin filtering effect in a quadruple quantum-dot cell
arXiv:1611.00141 · doi:10.1016/j.jmmm.2016.12.106
Abstract
A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra- and interdot Coulomb interactions on carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.
arXiv comment4 pages, 7 figures
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- The influence of Coulomb correlations on nonequilibrium quantum transport in quadruple quantum-dot structure
- Formation of droplets of the order parameter and superconductivity in inhomogeneous Fermi-Bose mixtures (Brief review)
- Local magnetic moments and electronic transport in closed loop quantum dot systems: a case of quadruple quantum dot ring at and away from equilibrium
- Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads
- Exact diagonalization study of double quantum dots in parallel geometry in zero-bandwidth limit