Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators
Mesoscale and Nanoscale Physics2016-09-21v1Materials Science
Separating the influence of hyperfine from spin-orbit interactions in spin-dependent carrier recombination and dissociation processes necessitates magnetic resonance spectroscopy over a wide range of frequencies. We have designed compact and versatile coplanar waveguide resonators for continuous-wave electrically detected magnetic resonance, and tested these on organic light-emitting diodes. By exploiting both the fundamental and higher-harmonic modes of the resonators we cover almost five octaves in resonance frequency within a single setup. The measurements with a common pi-conjugated polymer as the active material reveal small but non-negligible effects of spin-orbit interactions, which give rise to a broadening of the magnetic resonance spectrum with increasing frequency.
@article{arxiv.1603.03807,
title = {Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators},
author = {Gajadhar Joshi and Richards Miller and Lillie Ogden and Marzieh Kavand and Shirin Jamali and Kapildeb Ambal and Suresh Venkatesh and David Schurig and Hans Malissa and John M. Lupton and Christoph Boehme},
journal= {arXiv preprint arXiv:1603.03807},
year = {2016}
}