Quantum Transport Through a Stretched Spin--1 Molecule

Abstract

We analyze the electronic transport through a model spin-1 molecule as a function of temperature, magnetic field and bias voltage. We consider the effect of magnetic anisotropy, which can be generated experimentally by stretching the molecule. In the experimentally relevant regime the conductance of the unstretched molecule reaches the unitary limit of the underscreened spin- 1 Kondo effect at low temperatures. The magnetic anisotropy generates an antiferromagnetic coupling between the remaining spin 1/2 and a singular density of quasiparticles, producing a second Kondo effect and a reduced conductance. The results explain recent measurements in spin-1 molecules [Science 328 1370 (2010)].

5 pages, 3 figures, minor changes, accepted for publication in EPL

References in corpus (19)

• Time-dependent transport in interacting and non-interacting mesoscopic systems
• The numerical renormalization group method for quantum impurity systems
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Quantum phase transition in a single-molecule quantum dot
• Kondo effect in real quantum dots
• Strongly correlated regimes in a double quantum-dot device
• Quantum Phase Transition in a Multi-Level Dot
• Quantum phase transitions in models of coupled magnetic impurities
• Observation of the underscreened Kondo effect in a molecular transistor
• Singlet-triplet transition in a single-electron transistor at zero magnetic field
• Properties of anisotropic magnetic impurities on surfaces
• Regular and Singular Fermi Liquid fixed points in quantum impurity models
• Singular Dynamics of Underscreened Magnetic Impurity Models
• Correlated electron physics in multilevel quantum dots: phase transitions, transport, and experiment
• Singlet-triplet transition in a lateral quantum dot
• Nonequilibrium dynamics of a singlet-triplet Anderson impurity near the quantum phase transition
• Conductance of a spin-1 quantum dot: the two-stage Kondo effect
• Evidence of quantum criticality in the doped Haldane system Y2BaNiO5
• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2

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• Tunable Charge and Spin Seebeck Effects in Magnetic Molecular Junctions
• Memristive properties of single-molecule magnets
• Transport through side-coupled double quantum dots: from weak to strong interdot coupling
• Fully compensated Kondo effect for a two-channel spin S=1 impurity
• Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid
• Underscreened Kondo effect in S=1 magnetic quantum dots: Exchange, anisotropy and temperature effects
• Nonequilibrium conductance through a benzene molecule in the Kondo regime
• Magnetic field effects in few-level quantum dots: theory, and application to experiment
• Non-Fermi liquid behavior in transport through Co doped Au chains
• Many-body effects in magnetic inelastic electron tunneling spectroscopy
• Transport through side-coupled multilevel double quantum dots in the Kondo regime
• Modeling of gate controlled Kondo effect at carbon point-defects in graphene
• Replicas of the Kondo peak due to electron-vibration interaction in molecular transport properties
• Topological quantum phase transition between Fermi liquid phases in an Anderson impurity model
• Non-Fermi liquid behaviour in non-equilibrium transport through Co doped Au chains connected to four-fold symmetric leads
• Dynamical magnetic anisotropy and quantum phase transitions in a vibrating spin-1 molecular junction
• Two-stage three-channel Kondo physics for an FePc molecule on the Au(111) surface
• Kondo physics in a Ni impurity embedded in O-doped Au chains
• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• Kondo screening regimes of a quantum dot with a single Mn ion
• Ferromagnetic and underscreened Kondo behavior in quantum dot arrays
• Yu-Shiba-Rusinov multiplets and clusters of multiorbital adatoms in superconducting substrates: Subgap Green's function approach