Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems

Article

关键词: DENSITY-MATRIX RENORMALIZATION;    QUARTER-FILLED BAND;    ORGANIC CONDUCTORS;   

DOI  :  10.1103/PhysRevB.90.155112

来源: SCIE

【 摘 要 】

We investigate the real-time dynamics of photoexcited electronic instabilities in a charge-transfer system model, using the time-dependent density matrix renormalization group method. The model of choice was the quarter-filled one-dimensional extended Peierls-Hubbard Hamiltonian interacting with classical few-cycle electromagnetic radiation. The results show that only one electronic instability drives the main features of the photogenerated time-dependent behavior. Indeed, the photoresponse of the system shows a large enhancement of the 4k(F) (bond and charge) instability whereas the 2k(F) state remains largely unaffected. This conclusion holds regardless of the nature of the optical excitations and whether the system is perturbed resonantly or not. Our results suggest potential applications of charge-transfer systems with slow phononic dynamics as optoelectronic switching devices.

【 授权许可】

Free