Tunable Charge and Spin Seebeck Effects in Magnetic Molecular Junctions

Abstract

We study the charge and spin Seebeck effects in a spin-1 molecular junction as a function of temperature (T), applied magnetic field (H), and magnetic anisotropy (D) using Wilson's numerical renormalization group. A hard-axis magnetic anisotropy produces a large enhancement of the charge Seebeck coefficient Sc (\sim k_B/|e|) whose value only depends on the residual interaction between quasiparticles in the low temperature Fermi-liquid regime. In the underscreened spin-1 Kondo regime, the high sensitivity of the system to magnetic fields makes it possible to observe a sizable value for the spin Seebeck coefficient even for magnetic fields much smaller than the Kondo temperature. Similar effects can be obtain in C60 junctions where the control parameter is the gap between a singlet and a triplet molecular state.

5 pages, 4 figures

References in corpus (18)

• Spin Caloritronics
• The numerical renormalization group method for quantum impurity systems
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• Thermoelectric properties of the degenerate Hubbard model
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• Quantum Transport Through a Stretched Spin--1 Molecule

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• Nanoscale Spin Seebeck Rectifier: Controlling Thermal Spin Transport across Insulating Magnetic Junctions with Localized Spin
• Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime
• Nonequilibrium self-energies, Ng approach and heat current of a nanodevice for small bias voltage and temperature
• Fate of the spin-\frac{1}{2} Kondo effect in the presence of temperature gradients
• Effect of assisted hopping on thermopower in an interacting quantum dot
• Transport through side-coupled multilevel double quantum dots in the Kondo regime
• Spin thermopower in the overscreened Kondo model
• Spin filtering and thermopower in star coupled quantum dot devices
• Charge and Spin Thermoelectric Transport in Benzene-Based Molecular Nano-Junctions: A Quantum Many-Body Study
• Ferromagnetic and underscreened Kondo behavior in quantum dot arrays