Influence of spin waves on transport through a quantum-dot spin valve

Abstract

We study the influence of spin waves on transport through a single-level quantum dot weakly coupled to ferromagnetic electrodes with noncollinear magnetizations. Side peaks appear in the differential conductance due to emission and absorption of spin waves. We, furthermore, investigate the nonequilibrium magnon distributions generated in the source and drain lead. In addition, we show how magnon-assisted tunneling can generate a fullly spin-polarized current without an applied transport voltage. We discuss the influence of spin waves on the current noise. Finally, we show how the magnonic contributions to the exchange field can be detected in the finite-frequency Fano factor.

published version, 15 pages, 10 figures

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• Finite-frequency noise in a quantum dot with normal and superconducting leads
• Magnetic field effects on the finite-frequency noise and ac conductance of a Kondo quantum dot out of equilibrium
• Magnon transport through a quantum dot: Conversion to electronic spin and charge currents
• Higgs-like pair amplitude dynamics in superconductor-quantum dot hybrids
• Mesoscopic Stoner instability in metallic nanoparticles revealed by shot noise
• Relaxation dynamics in double-spin systems
• Magnon cotunneling through a quantum dot