Detection of electron spin resonance in the strong, non-linear drive regime using spin-dependent charge carrier recombination currents and an amplitude-modulated continuous wave electrically detected magnetic resonance scheme

ORAL

Abstract

Electrically detected magnetic resonance spectroscopy of organic light-emitting diodes with conductive polymers as active layers allows for the study of high-magnetic resonance drive regimes of electron spins in which Zeeman fields are on the same magnitude as drive field amplitudes [1, 2]. Drive amplitude limits of such non-linear magnetic resonance experiments are posed by the superposition of the studied spin-dependent electric currents with other, randomly occurring, radiation-induced artifact signals, possibly due to electric dipole transitions in lowest unoccupied molecular orbitals. Here, we demonstrate the use of amplitude-modulated lock-in detection for the isolation of these two electric current signatures, taking advantage of their different dynamic natures. We validate this approach by analyzing the dependence of the lock-in detected signals on modulation phase and frequency and demonstrate a significant signal improvement allowing for the detection of multi-photon magnetic dipole transitions and the Bloch-Siegert shift. [1] S. Jamali et. al., Nano Lett., 17, 4648 (2017), [2] S. Jamali et. al. (unpublished).

*Supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-SC0000909.

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Presenters

  • Sabastian Atwood

    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

Authors

  • Sabastian Atwood

    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

  • Adnan Nahlawi

    • The University of Utah
    • Department of Physics and Astronomy, University of Utah

  • Sanaz Hosseinzadeh

    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

  • Taniya Hansika Tennahewa

    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

  • Henna Popli

    • Physics and Astronomy, University of Utah
    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

  • Hans Malissa

    • Physics and Astronomy, University of Utah
    • The University of Utah
    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah

  • John M Lupton

    • Institut für Experimentelle und Angewandte Physik, Universität Regensburg

  • Christoph M Boehme

    • Physics and Astronomy, University of Utah
    • The University of Utah
    • Department of Physics and Astronomy, University of Utah
    • Physics And Astronomy, University of Utah