Magnon transport and spin current switching through quantum dots

Abstract

We study the nonequilibrium spin current through a quantum dot consisting of two localized spin-1/2 coupled to two ferromagnetic insulators. The influence of an intra-dot magnetic field and exchange coupling, different dot-reservoir coupling configurations, and the influence of magnon chemical potential differences vs. magnetic field gradients onto the spin current are examined. We discuss various spin switching mechanisms and find that, in contrast to electronic transport, the spin current is very sensitive to the specific coupling configuration and band edges. In particular, we identify 1- and 2-magnon transport processes which can lead to resonances and antiresonances for the spin current.

10 pages, 15 figures

References in corpus (8)

• Magnetization transport and quantized spin conductance
• Magnon Heat Transport in (Sr,La)_14Cu_24O_41
• The thermal conductivity of the spin-1/2 XXZ chain at arbitrary temperature
• Conductance of a quantum wire at low electron density
• Thermal conductivity of anisotropic and frustrated spin-1/2 chains
• Thermal Conductivity of Spin-1/2 Chains
• Anomalous thermal conductivity of frustrated Heisenberg spin-chains and ladders
• Spin Dependent Transport in Magnetic Nanostructures

Cited by in corpus (4)

• Magnon-driven quantum-dot heat engine
• Magnon transport through a quantum dot: Conversion to electronic spin and charge currents
• Fingerprints of the Magnetic Polaron in Nonequilibrium Electron Transport through a Quantum Wire Coupled to a Ferromagnetic Spin Chain
• Magnon cotunneling through a quantum dot