Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/90492
Type: Artigo de periódico
Title: Hopping Magnetotransport Via Nonzero Orbital Momentum States And Organic Magnetoresistance
Author: Alexandrov A.S.
Dediu V.A.
Kabanov V.V.
Abstract: In hopping magnetoresistance of doped insulators, an applied magnetic field shrinks the electron (hole) s-wave function of a donor or an acceptor and this reduces the overlap between hopping sites resulting in the positive magnetoresistance quadratic in a weak magnetic field, B. We extend the theory of hopping magnetoresistance to states with nonzero orbital momenta. Different from s states, a weak magnetic field expands the electron (hole) wave functions with positive magnetic quantum numbers, m>0, and shrinks the states with negative m in a wide region outside the point defect. This together with a magnetic-field dependence of injection/ionization rates results in a negative weak-field magnetoresistance, which is linear in B when the orbital degeneracy is lifted. The theory provides a possible explanation of a large low-field magnetoresistance in disordered π-conjugated organic materials. © 2012 American Physical Society.
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Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.108.186601
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84860452487&partnerID=40&md5=6a8d1355d74bfba11842a904d35e70b8
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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