Spin-flip processes of polarons by magnetic impurities in conjugated polymers.
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.
Zhao
Hui
H
Department of Physics, Tongji University, Shanghai 200092, China. zhaoh@fudan.edu.cn
Chen
Yu-Guang
YG
Yao
Yao
Y
Wu
Chang-Qin
CQ
Zhang
Xu-Ming
XM
An
Zhong
Z