Resonant and Kondo tunneling through molecular magnets

Abstract

Transport through molecular magnets is studied in the regime of strong coupling to the leads. We consider a resonant-tunneling model where the electron spin in a quantum dot or molecule is coupled to an additional local, anisotropic spin via exchange interaction. The two opposite regimes dominated by resonant tunneling and by Kondo transport, respectively, are considered. In the resonant-tunneling regime, the stationary state of the impurity spin is calculated for arbitrarily strong molecule-lead coupling using a master-equation approach, which treats the exchange interaction perturbatively. We find that the characteristic fine structure in the differential conductance persists even if the hybridization energy exceeds thermal energies. Transport in the Kondo regime is studied within a diagrammatic approach. We show that magnetic anisotropy gives rise to a splitting of the Kondo peak at low bias voltages.

13 pages, 5 figures, version as published

References in corpus (23)

• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy
• Tunneling through molecules and quantum dots: master-equation approaches
• Transport through anisotropic magnetic molecules with partially ferromagnetic leads: Spin-charge conversion and negative differential conductance
• Kondo resonances and anomalous gate dependence of electronic conduction in single-molecule transistors
• Tunneling Spectra of Individual Magnetic Endofullerene Molecules
• Vibrational Sidebands and Kondo-effect in Molecular Transistors
• Kondo-transport spectroscopy of single molecule magnets
• Spin Polarized Transport Through a Single-Molecule Magnet: Current-Induced Magnetic Switching
• Nonequilibrium Transport through a Kondo Dot in a Magnetic Field: Perturbation Theory
• Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions
• Spin effects in transport through single-molecule magnets in the sequential and cotunneling regimes
• Frequency-Dependent Current Noise through Quantum-Dot Spin Valves
• Kondo effect in single-molecule magnet transistors
• Cotunneling and non-equilibrium magnetization in magnetic molecular monolayers
• Spin-bias driven magnetization reversal and nondestructive detection in a single molecular magnet
• Dynamical symmetry breaking in transport through molecules
• Kondo effect in carbon nanotube quantum dots with spin-orbit coupling
• Spin-induced charge correlations in transport through interacting quantum dots with ferromagnetic leads
• First-principles study of a single-molecule magnet Mn_{12} monolayer on the Au(111) surface
• Transconductance of a double quantum dot system in the Kondo regime
• Electron transport in the four-lead two-impurity Kondo model: Nonequilibrium perturbation theory with almost degenerate levels
• Colossal spin fluctuations in a molecular quantum dot magnet with ferromagnetic electrodes

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• Transport mirages in single-molecule devices
• The Influence of Magnetic Anisotropy on the Kondo Effect and Spin-Polarized Transport through Magnetic Molecules, Adatoms and Quantum Dots
• Memristive properties of single-molecule magnets
• A pertubative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates
• Tight Binding Model of Mn12 Single Molecule Magnets: Electronic and Magnetic Structure and Transport Properties
• Ligand-based transport resonances of single-molecule magnet spin filters: Suppression of the Coulomb blockade and determination of the orientation of the magnetic easy axis
• Limit-Cycles and Chaos in the Current Through a Quantum Dot
• Temperature dependence of electronic transport through molecular magnets in the Kondo regime
• Transverse anisotropy effects on spin-resolved transport through large-spin molecules
• Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy
• Intrinsic spin-relaxation induced negative tunnel magnetoresistance in a single-molecule magnet
• Synthesizing and Controlling Helical Indirect Exchange Interactions at Nonequilibrium
• Tunnel magnetoresistance of a supramolecular spin valve
• Effect of uniaxial magnetic anisotropy on charge transport in a junction with a precessing anisotropic molecular spin
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque