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Spin Filter Effect in Organic Polymers in the Presence of Local Magnetic Field |
| YAN Yong-Hong;CHEN Mei-Juan;WU Chang-Qin |
| Department of Physics, Fudan University, Shanghai 200433 |
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| Cite this article: |
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YAN Yong-Hong, CHEN Mei-Juan, WU Chang-Qin 2006 Chin. Phys. Lett. 23 2549-2552 |
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Abstract Using a nonadiabatic evolution method, we investigate the spin filter effect in organic polymers in the presence of a local magnetic field. Through a spin-dependent magnetic field, polarons (charge carrier) with different spins will feel repulsive or attractive force determined by their spins. Our simulations show that in a single-site magnetic field (affecting electrons at a single site), for example V150=0.35eV, or V150=0.45eV, a spin-up polaron accelerated to saturated velocity by an electric field can pass through the field while the spin-down polaron is trapped. When the local field extends over several sites (Vn ～ exp[-(n-nc) sup>2/n2w]), similar behaviour is also found. Simultaneously we find that it is more likely to realize the spin filter effect in a comparatively large field since the polaron which feels attractive force is easily trapped by a local magnetic field.
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| Keywords:
71.38.-k
72.25.-b
72.80.Le
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Published: 01 September 2006
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| PACS: |
71.38.-k
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(Polarons and electron-phonon interactions)
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72.25.-b
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(Spin polarized transport)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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