Polaron spin echo envelope modulations in an organic semiconducting polymer

Journal Article (2017)
Author(s)

V. V. Mkhitaryan (Iowa State University)

V. V. Dobrovitski (TU Delft - QID/Dobrovitski Group, Iowa State University)

Research Group
QID/Dobrovitski Group
Copyright
© 2017 V. V. Mkhitaryan, V.V. Dobrovitski
DOI related publication
https://doi.org/10.1103/PhysRevB.95.214202
More Info
expand_more
Publication Year
2017
Language
English
Copyright
© 2017 V. V. Mkhitaryan, V.V. Dobrovitski
Research Group
QID/Dobrovitski Group
Issue number
21
Volume number
95
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

We present a theoretical analysis of the electron spin echo envelope modulation (ESEEM) spectra of polarons in semiconducting π-conjugated polymers. We show that the contact hyperfine coupling and the dipolar interaction between the polaron and the proton spins give rise to different features in the ESEEM spectra. Our theory enables direct selective probe of different groups of nuclear spins, which affect the polaron spin dynamics. Namely, we demonstrate how the signal from the distant protons (coupled to the polaron spin via dipolar interactions) can be distinguished from the signal coming from the protons residing on the polaron site (coupled to the polaron spin via contact hyperfine interaction). We propose a method for directly probing the contact hyperfine interaction, that would enable detailed study of the polaron orbital state and its immediate environment. We also analyze the decay of the spin echo modulation, and its connection to the polaron transport.

Files

PhysRevB.95.214202.pdf
(pdf | 0.951 Mb)
License info not available