Nonequilibrium Dynamics of Anisotropic Large Spins in the Kondo Regime: Time-Dependent Numerical Renormalization Group Analysis

Abstract

We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S > 1/2, we analyze the underscreening of the local moment and the effect of anisotropy terms on the relaxation dynamics of the magnetization. Underscreening by single-channel Kondo processes leads to a logarithmically slow relaxation, while finite uniaxial anisotropy causes a saturation of the SMM's magnetization. Additional transverse anisotropy terms induce quantum spin tunneling and a pseudospin-1/2 Kondo effect sensitive to the spin parity.

4 pages, 5 figures, published version

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• Spin effects in transport through single-molecule magnets in the sequential and cotunneling regimes
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• Nonequilibrium Spin Dynamics in the Ferromagnetic Kondo Model
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• Non-equilibrium magnetization dynamics of ferromagnetically coupled Kondo spins
• Quench dynamics of spin in quantum dots coupled to spin-polarized leads
• Macrospin approximation and quantum effects in models for magnetization reversal
• Transverse anisotropy effects on spin-resolved transport through large-spin molecules
• Real-time effective-action approach to the Anderson quantum dot
• The Functional Renormalization Group for Zero-Dimensional Quantum Systems in and out of Equilibrium
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires
• Dynamics of large anisotropic spin in a sub-ohmic dissipative environment close to a quantum-phase transition
• Dynamics of symmetry breaking during quantum real-time evolution in a minimal model system
• Time-dependent spintronic anisotropy in magnetic molecules
• Magnetic field modulated Kondo effect in a single-magnetic-ion molecule