Spin-flip processes of polarons by magnetic impurities in conjugated polymers.
J Chem Phys
; 131(15): 154901, 2009 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-20568878
ABSTRACT
By employing an adaptive time-dependent density-matrix-renormalization-group method, the spin-flip process of polarons is investigated in a polymer chain with magnetic impurities. Being driven by an external electric field, a polaron carrying both spin 1/2 and charge +/-e moves at a constant speed in the polymer chain. When the polaron passes through a specific site, which couples to a magnetic impurity via spin-exchange interaction, a spin-flip process is observed if its spin is antiparallel to the impurity spin. Our results show that the spin-flip probability is enhanced by the on-site Coulomb interaction and increases with increase in the spin-exchange integral. Additionally, some possible applications of the spin-state swap between the polaron and the impurity are discussed.
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MEDLINE
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article