Reverse polarization in charged pi-conjugated oligomers.
Single-photon excitation in a charged pi-conjugated oligomer is studied theoretically. An apparent reverse polarization is obtained through single-photon excitation, which is different from that obtained through a double-photon excitation. The polarizability is calculated and it is found that a maximum reverse polarization will appear at a suitable conjugation length. In addition, we indicate that the reverse polarization is a nonlinear behavior with the induced electric field. Effects of nondegenerate confinement and interchain interactions on the reverse polarization are also discussed.
Gao
Kun
K
School of Physics and Microelectronics, Shandong University, Jinan 250100, People's Republic of China.
Liu
Xiao-jing
XJ
Liu
De-sheng
DS
Xie
Shi-jie
SJ