Effect of Electronic Correlations on Magnetotransport through a Parallel Double Quantum Dot

We theoretically investigate the effect of electronic correlations (including spin and Coulomb correlations) on magnetotransport through a parallel double quantum dot coupled to ferromagnetic leads. Within the framework of the generalized master equation, we analyze the current, differential conductance and tunnel magnetoresistance versus bias for different electron correlations. Our results reveal that spin correlations can induce a giant tunnel magnetoresistance, while Coulomb correlations can lead to the occurrence of negative tunnel magetoresistance and negative differential conductance, and the relevant underlying physics of this problem is discussed.