Electronic Transport Through Double Quantum Dot Coupled to Majorana Bound States and Ferromagnetic Leads

We have studied theoretically the properties of electrical current and tunnel magnetoresistance (TMR) through a serially connected double quantum dot (DQD) sandwiched between two ferromagnetic leads by using nonequilibrium Green’s function technique. consider that each DQD couples to one mode Majorana bound states (MBSs) formed at ends topological superconductor nanowire with spin-dependent coupling strength. By adjusting sign spin polarization dot–MBS strength arrangement magnetic moments leads, currents’ magnitude can be effectively enhanced or suppressed. Under some conditions, negative TMR emerges which is useful in detection MBSs, research subject currently under extensive investigations. Moreover, amplitude adjusted large regime variation several system parameters, such as direct hybridization MBSs dots positions dots’ energy levels. Such tunable currents may also find use high-efficiency spintronic devices information processes.