Ferromagnetic lead effects on inelastic cotunneling current and shot noise of an interacting quantum dot

摘要

We analyze inelastic cotunneling through a strongly Coulomb-blockaded quantum dot attached to two ferromagnetic leads in the weak coupling limit using a quantum Langevin equation approach, from which we derive a fully microscopic quantum based Bloch-type equation to describe the cotunneling-induced spin relaxation dynamics. Based on this, we then obtain explicit analytical expressions for the local magnetization, cotunneling current, and its fluctuations.