Journal article
Semiclassical theory of magnetoresistance in positionally disordered organic semiconductors
Physical review. B, Condensed matter and materials physics, Vol.85(7), 075204
02/2012
DOI: 10.1103/PhysRevB.85.075204
Abstract
A recently introduced percolative theory of unipolar organic magnetoresistance is generalized by treating the hyperfine interaction semiclassically for an arbitrary hopping rate. Compact analytic results for the magnetoresistance are achievable when carrier hopping occurs much more frequently than the hyperfine field precession period. In other regimes the magnetoresistance can be straightforwardly evaluated numerically. Slow and fast hopping magnetoresistance are found to be uniquely characterized by their line shapes. We find that the threshold hopping distance is analogous a phenomenological two-site model's branching parameter, and that the distinction between slow and fast hopping is contingent on the threshold hopping distance.
Details
- Title: Subtitle
- Semiclassical theory of magnetoresistance in positionally disordered organic semiconductors
- Creators
- N. J HarmonM. E Flatté
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Condensed matter and materials physics, Vol.85(7), 075204
- DOI
- 10.1103/PhysRevB.85.075204
- ISSN
- 1098-0121
- eISSN
- 1550-235X
- Language
- English
- Date published
- 02/2012
- Academic Unit
- Physics and Astronomy; Electrical and Computer Engineering
- Record Identifier
- 9984200052702771
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