The effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors |
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Authors: | Zhao Jun-Qing Ding Meng Zhang Tian-You Zhang Ning-Yu Pang Yan-Tao Ji Yan-Ju Chen Ying Wang Feng-Xiang Fu Gang |
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Institution: | School of Science, Shandong Jianzhu University, Jinan 250101, China |
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Abstract: | We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors. A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current. The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron--hole pairs, and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field. The field dependence, the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron--hole pairs. The simulated magnetoresistance shows good consistency with the experimental results. |
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Keywords: | organic magnetoresistance spin-orbit coupling recombination spin precession |
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