Photon-assisted electronic and spin transport in a junction containing precessing molecular spin

Abstract

We study the ac charge and -spin transport through an orbital of a magnetic molecule with spin precessing in a constant magnetic field. We assume that the source and drain contacts have time-dependent chemical potentials. We employ the Keldysh nonequilibrium Green's functions method to calculate the spin and charge currents to linear order in the time-dependent potentials. The molecular and electronic spins are coupled via exchange interaction. The time-dependent molecular spin drives inelastic transitions between the molecular quasienergy levels, resulting in a rich structure in the transport characteristics. The time-dependent voltages allow us to reveal the internal precession time scale (the Larmor frequency) by a dc conductance measurement if the ac frequency matches the Larmor frequency. In the low-ac-frequency limit the junction resembles a classical electric circuit. Furthermore, we show that the setup can be used to generate dc-spin currents, which are controlled by the molecular magnetization direction and the relative phases between the Larmor precession and the ac voltage.

15 pages, 10 figures

References in corpus (14)

• Spin Transfer Torques
• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Driven quantum transport on the nanoscale
• Spin-transfer torque in magnetic tunnel junctions: Scattering theory
• Rectification of laser-induced electronic transport through molecules
• Influence of chopped laser light onto the electronic transport through atomic-sized contacts
• Modeling elastic and photoassisted transport in organic molecular wires: length dependence and current-voltage characteristics
• Ground-state cooling of a carbon nanomechanical resonator by spin-polarized current
• Coherent laser control of the current through molecular junctions
• Switching the current through molecular wires
• Superconducting atomic contacts under microwave irradiation
• Photoconductance of organic single-molecule contacts
• Role of electronic structure in photoassisted transport through atomic-sized contacts
• The Role of Bound States in Time-Dependent Quantum Transport

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• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Shot noise of charge and spin transport in a junction with a precessing molecular spin
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque
• Effect of uniaxial magnetic anisotropy on charge transport in a junction with a precessing anisotropic molecular spin