Spin Transport Through Asymmetric Coupled Quantum Dots Between Ferromagnetic Leads

Abstract

The study examines a fascinating combination of ferromagnetic leads and double quantum dots in a hybrid system. The "two coupled quantum dots Anderson model" is employed to model the coupled quantum dots and simulate the energy levels of the double coupled quantum dots, which interact with both left and right ferromagnetic leads to investigate the process of spin tunneling. This study discusses the role of coupling interaction between quantum dots the Coulomb correlation within each quantum dot, and their connection with the ferromagnetic leads. We determine the occupation number of the energy levels in the quantum dots and solve it in a self-consistent manner. These solutions are then used to compute each quantum dot's spin accumulation. The results are used to compute the spin current tunneling and examine the system's transport characteristics.