Model of transient cooperative phenomena triggered by THz-pulse irradiation

4th International Conference on Mathematical Modeling in Physical Sciences

物理学;数学

Ishida, Kunio^1 ; Nasu, Keiichiro^2

Corporate Research and Development Center, Toshiba Corporation, Kawasaki

212-8582, Japan^1

Institute of Materials Structure Science, KEK, Tsukuba

305-0801, Japan^2

关键词: Adiabatic potential energy surface;    Cooperative interactions;    Cooperative phenomenon;    Excited electrons;    Localized electrons;    Optical phonon modes;    Photo-induced phase transitions;    Quantum mechanical;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/633/1/012061/pdf
DOI  :  10.1088/1742-6596/633/1/012061

来源: IOP

【 摘 要 】

We studied the cooperative phenomena induced by injection of coherent phonons by THz optical pulses. Based on the analogy to the photoinduced phase transitions observed in various materials, we consider that cooperative interactions between electrons and coherent phonons will lead to the multiplication of excited electrons and/or growth of a transient phase, which is understood by bifurcation of quantum-mechanical wavepackets on adiabatic potential energy surfaces. Employing a model of localized electrons coupled with a quantized optical phonon mode, we discuss the dynamics of the cooperative phenomena by THz-pulse irradiation and, in particular, the role of the number and/or the initial distribution of phonons in the initial creation process of transient phases.