Study of couplings effect on the performance of a spin-current diode: Nonequilibrium Green's function based model

Abstract

In this paper, spin-dependent transport through a spin diode composed of a quantum dot coupled to a normal metal and a ferromagnetic lead is studied. The current polarization and the spin accumulation are analyzed using the equations of motion method within the nonequilibrium Green's function formalism. We present a suitable method for computing Green's function without carrying out any self-consistent calculation. The influence of coupling strength and magnetic field on the spin current is studied and observed that this device cannot work as a spin diode under certain conditions.

9 pages, 3 figures

References in corpus (13)

• Spin qubits in graphene quantum dots
• Pauli-Spin-Blockade Transport through a Silicon Double Quantum Dot
• Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
• Quantum Dot as a Spin--Current Diode
• Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads
• Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions
• Kondo effects in a triangular triple quantum dot: NRG study in the whole region of the electron filling
• The electron transport through a quantum dot in the Coulomb blockade regime: Non-equilibrium Green's functions based model
• Using spin bias to manipulate and measure quantum spin in quantum dots
• Spin diode based on a single-wall carbon nanotube
• Current and Shot Noise Measurements in a Carbon Nanotube-Based Spin Diode
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Kondo effect in a quantum dot coupled to ferromagnetic leads and side-coupled to a nonmagnetic reservoir