van Schooten, Kipp J. and Baird, Douglas L. and Limes, Mark E. and Lupton, John M. and Boehme, Christoph (2015) Probing long-range carrier-pair spin-spin interactions in a conjugated polymer by detuning of electrically detected spin beating. NATURE COMMUNICATIONS, 6: 6688. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
Weakly coupled electron spin pairs that experience weak spin-orbit interaction can control electronic transitions in molecular and solid-state systems. Known to determine radical pair reactions, they have been invoked to explain phenomena ranging from avian magnetoreception to spin-dependent charge-carrier recombination and transport. Spin pairs exhibit persistent spin coherence, allowing minute magnetic fields to perturb spin precession and thus recombination rates and photoreaction yields, giving rise to a range of magneto-optoelectronic effects in devices. Little is known, however, about interparticle magnetic interactions within such pairs. Here we present pulsed electrically detected electron spin resonance experiments on poly(styrene-sulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) devices, which show how interparticle spin-spin interactions (magnetic-dipolar and spin-exchange) between charge-carrier spin pairs can be probed through the detuning of spin-Rabi oscillations. The deviation from uncoupled precession frequencies quantifies both the exchange (<30 neV) and dipolar (23.5 +/- 1.5 neV) interaction energies responsible for the pair's zero-field splitting, implying quantum mechanical entanglement of charge-carrier spins over distances of 2.1 +/- 0.1 nm.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ROOM-TEMPERATURE; RESONANCE; EXCHANGE; MODEL; SEMICONDUCTORS; SEPARATION; TRANSPORT; MEMORY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Jul 2019 12:58 |
| Last Modified: | 22 Jul 2019 12:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5702 |
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