Cotunneling through a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations

Abstract

Spin-dependent electronic transport through a quantum dot has been analyzed theoretically in the cotunneling regime by means of the second-order perturbation theory. The system is described by the impurity Anderson Hamiltonian with arbitrary Coulomb correlation parameter $U$. It is assumed that the dot level is intrinsically spin-split due to an effective molecular field exerted by a magnetic substrate. The dot is coupled to two ferromagnetic leads whose magnetic moments are noncollinear. The angular dependence of electric current, tunnel magnetoresistance, and differential conductance are presented and discussed. The evolution of a cotunneling gap with the angle between magnetic moments and with the splitting of the dot level is also demonstrated.

accepted for publication in Eur. Phys. J. B

References in corpus (2)

• Kondo effect in quantum dots coupled to ferromagnetic leads
• Quantum spin pumping with adiabatically modulated magnetic barrier's

Cited by in corpus (15)

• Spin effects in single electron tunneling
• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
• Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads
• Spin Current and Current-Induced Spin Transfer Torque in Ferromagnet-Quantum Dot-Ferromagnet Coupled Systems
• Electronic waiting-time distribution of a quantum-dot spin valve
• Transport through a double quantum dot system with non-collinearly polarized leads
• Cotunneling through quantum dots coupled to magnetic leads: zero-bias anomaly for non-collinear magnetic configurations
• Probing the exchange field of a quantum-dot spin valve by a superconducting lead
• Effect of intrinsic spin relaxation on the spin-dependent cotunneling transport through quantum dots
• Spin resonance without spin splitting
• Influence of spin waves on transport through a quantum-dot spin valve
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization
• Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
• Spin current and polarization reversal through a single-molecule magnet with ferromagnetic electrodes