Non-collinear magnetoconductance of a quantum dot

Abstract

We study theoretically the linear conductance of a quantum dot connected to ferromagnetic leads. The dot level is split due to a non-collinear magnetic field or intrinsic magnetization. The system is studied in the non-interacting approximation, where an exact solution is given, and, furthermore, with Coulomb correlations in the weak tunneling limit. For the non-interacting case, we find an anti-resonance for a particular direction of the applied field, non-collinear to the parallel magnetization directions of the leads. The anti-resonance is destroyed by the correlations, giving rise to an interaction induced enhancement of the conductance. The angular dependence of the conductance is thus distinctly different for the interacting and non-interacting cases when the magnetizations of the leads are parallel. However, for anti-parallel lead magnetizations the interactions do not alter the angle dependence significantly.

7 pages, 7 figures

References in corpus (9)

• Spintronics: Fundamentals and applications
• Kondo effect in quantum dots coupled to ferromagnetic leads
• Spin-dependent transport in molecular tunnel junctions
• Theory of Transport through Quantum-Dot Spin Valves in the Weak-Coupling Regime
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Interaction-driven spin precession in quantum-dot spin valves
• A Single Atom Transistor in a 1D Optical Lattice
• Rate equations for Coulomb blockade with ferromagnetic leads
• Spin effects in electron tunnelling through a quantum dot coupled to non-collinearly polarized ferromagnetic leads

Cited by in corpus (19)

• Spin effects in single electron tunneling
• Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations
• 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
• Coherent effects in magneto-transport through Zeeman split levels
• 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
• Interference through quantum dots
• Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor
• Resonant magneto-tunneling between normal and ferromagnetic electrodes in relation to the three-terminal spin transport
• Spin-resolved electron waiting times in a quantum dot spin valve
• Exchange effects on electron transport through single-electron spin-valve transistors
• 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
• Coulomb Blockade of a Three-terminal Quantum Dot