Department of Physics, Tongji University, Shanghai 200092, China.
J Chem Phys. 2009 Oct 21;131(15):154901. doi: 10.1063/1.3247189.
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.
采用自适应时变密度矩阵重整化群方法，研究了聚合物链中带有磁性杂质的极化子的自旋翻转过程。在外电场的驱动下，一个带有自旋 1/2 和电荷 +/-e 的极化子以恒定速度在聚合物链中运动。当极化子通过一个特定的位置时，它通过自旋交换相互作用与磁性杂质耦合，如果它的自旋与杂质自旋相反，则会观察到自旋翻转过程。我们的结果表明，自旋翻转概率被局域库仑相互作用增强，并随自旋交换积分的增加而增加。此外，还讨论了极化子和杂质之间的自旋态交换的一些可能应用。
