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

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SFB 767 -Teilprojekt Z
Ultrafast Quantum Physics in Amplitude and Phase - UltraPhase, ERC Advanced Grant
Quantum Manipulation of Spins in Semiconductors
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Physical Review B ; 93 (2016), 7. - 075402. - ISSN 2469-9950. - eISSN 2469-9969
Zusammenfassung
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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ISO 690FILIPOVIC, Milena, Wolfgang BELZIG, 2016. Photon-assisted electronic and spin transport in a junction containing precessing molecular spin. In: Physical Review B. 93(7), 075402. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.93.075402
BibTex
@article{Filipovic2016-02-01Photo-33399,
  year={2016},
  doi={10.1103/PhysRevB.93.075402},
  title={Photon-assisted electronic and spin transport in a junction containing precessing molecular spin},
  number={7},
  volume={93},
  issn={2469-9950},
  journal={Physical Review B},
  author={Filipovic, Milena and Belzig, Wolfgang},
  note={Article Number: 075402}
}
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