Journal article
Spin-orbit coupling, spin relaxation, and spin diffusion in organic solids
Physical review letters, Vol.106(10), pp.106602-106602
03/11/2011
Handle:
https://hdl.handle.net/2376/107149
PMID: 21469820
Abstract
We develop a systematic approach of quantifying spin-orbit coupling (SOC) and a rigorous theory of carrier spin relaxation caused by the SOC in disordered organic solids. The SOC mixes up and down spin in the polaron states and can be characterized by an admixture parameter γ2. This mixing effects spin flips as polarons hop from one molecule to another. The spin relaxation time is τ(sf) = R2/(16γ2 D), and the spin diffusion length is L(s) = R/4|γ|, where R is the mean polaron hopping distance and D the carrier diffusion constant. The SOC in tris-(8-hydroxyquinoline) aluminum (Alq3) is particularly strong due to the orthogonal arrangement of the three ligands. The theory quantitatively explains the temperature-dependent spin diffusion in Alq3 from recent muon measurements.
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Details
- Title
- Spin-orbit coupling, spin relaxation, and spin diffusion in organic solids
- Creators
- Z G Yu - Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, USA
- Publication Details
- Physical review letters, Vol.106(10), pp.106602-106602
- Academic Unit
- Institute for Shock Physics
- Publisher
- United States
- Identifiers
- 99900546998301842
- Language
- English
- Resource Type
- Journal article