Chin. Phys. Lett.  2006, Vol. 23 Issue (9): 2549-2552    DOI:
Original Articles |
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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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.
Keywords: 71.38.-k      72.25.-b      72.80.Le     
Published: 01 September 2006
PACS:  71.38.-k (Polarons and electron-phonon interactions)  
  72.25.-b (Spin polarized transport)  
  72.80.Le (Polymers; organic compounds (including organic semiconductors))  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I9/02549
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