Journal article
Spin-orbit coupling in singly charged pi-conjugated polymers
Physical review. B, Condensed matter and materials physics, Vol.79(15), 153202
04/01/2009
DOI: 10.1103/PhysRevB.79.153202
Abstract
Understanding spin-orbit coupling in singly charged pi-conjugated polymer chains is of basic importance to the study of spin transport in organic semiconductors. We show that the spin-orbit coupling is quenched to first order because the diagonal matrix elements vanish and the energy levels in polymers are orbitally nondegenerate. Even the off-diagonal matrix elements are zero or negligibly small unless a twisted nonplanar polymer chain is considered. For such a twisted chain, we calculate these matrix elements using tight-binding wave functions based on p(z) orbitals. We show that the Kramers degeneracy prevents the spin-orbit-induced spin precession. Instead, we propose a phonon-assisted spin-flip process and calculate its rate.
Details
- Title: Subtitle
- Spin-orbit coupling in singly charged pi-conjugated polymers
- Creators
- J. Rybicki - University of IowaM. Wohlgenannt - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Condensed matter and materials physics, Vol.79(15), 153202
- DOI
- 10.1103/PhysRevB.79.153202
- NLM abbreviation
- Phys Rev B Condens Matter Mater Phys
- ISSN
- 1098-0121
- eISSN
- 1550-235X
- Publisher
- American Physical Society
- Number of pages
- 4
- Grant note
- ECS 07-25280 / NSF; National Science Foundation (NSF) W911NF-08-1-0317 / Army MURI; MURI
- Language
- English
- Date published
- 04/01/2009
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428815402771
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