Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators

Abstract

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.

References in corpus (4)

• Coplanar Waveguide Resonators for Circuit Quantum Electrodynamics
• Fast, low-power manipulation of spin ensembles in superconducting microresonators
• Modulation frequency dependence of continuous-wave optically/electrically detected magnetic resonance
• Broadband Electrically Detected Magnetic Resonance Using Adiabatic Pulses

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