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

Milena Filipović and Wolfgang Belzig
Phys. Rev. B 93, 075402 – Published 1 February 2016

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.

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  • Received 12 December 2014

DOI:https://doi.org/10.1103/PhysRevB.93.075402

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Milena Filipović and Wolfgang Belzig

  • Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany

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Issue

Vol. 93, Iss. 7 — 15 February 2016

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