DETECTION OF STRONG MAGNETIC RESONANT DRIVE EFFECTS USING SPIN-DEPENDENT ELECTRONIC TRANSITION RATES IN ORGANIC SEMICONDUCTOR MATERIALS

ORAL

Abstract

Spin-dependent recombination currents in π-conjugated polymers allow for the detection of charge carrier spin resonance at very weak applied static Zeeman fields B0 [1]. We have used this effect to study magnetic resonance in the strong driving regime when the amplitude of the driving field B1 ~ B0. Technologically, these measurements were carried out by using monolithic thin-film device structures in which a polymer bipolar injection device [an organic light emitting diode] was fabricated directly on top of an RF microwire [2]. We used a fully deuterated form of poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] as active device layer due to its low local hyperfine fields. Under strong-drive, spin collectivity set in [1,2] and a variety of strong drive effects could be observed, including the Bloch-Siegert shift and two photon transitions. The measured dependence of the former on B1 confirmed theoretical predictions, suggesting that the monolithic nano-layer device stack used in these experiments could serve as probe for ultra-strong light-matter coupling of paramagnetic charge carriers in polymer materials. [1] Waters et al., Nature Phys., 2015, 11, 910; [2] Jamali et al., Nano Lett., 2017, 17, 4648.

*We acknowledge support from the DOE under Award #DE-SC0000909

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Presenters

  • Shirin Jamali

    • University of Utah
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.

Authors

  • Shirin Jamali

    • University of Utah
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.

  • Hans Malissa

    • University of Utah
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA

  • Dani Stoltzfus

    • Centre for Organic Photonics and Electronics, School of Chemistry & Molecular Biosciences, The University of Queensland, Queensland 4072, Australia.
    • Centre for Organic Photonics and Electronics, School of Chemistry & Molecular Biosciences, The University of Queensland, Queensland 4072, Australia

  • Paul Burn

    • Centre for Organic Photonics and Electronics, School of Chemistry & Molecular Biosciences, The University of Queensland, Queensland 4072, Australia.

  • Tamim Darwish

    • The National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia.
    • National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia

  • Anna Leung

    • The National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia.
    • National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia

  • John Lupton

    • Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31-93040 Regensburg, Germany.
    • Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany

  • Christoph Boehme

    • University of Utah
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.
    • Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA