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.

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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