用时间和频率分辨泵浦探测光谱法解纠缠电荷转移绝缘体中的热和非热激发态
Disentangling thermal and non-thermal excited states in a charge-transfer insulator by time-and-frequency resolved pump-probe spectroscopy
摘要：
时间和频率分辨泵浦-探测光谱被用来研究绝缘CuGeO 3中的电荷转移过程对离域激发脉冲注入的影响。在亚ps时间尺度上观察到电荷转移边缘的大加宽。这种光谱特征的改变不能归因于泵浦脉冲吸收能量导致的有效温度的局部升高。测量的系统的光学性质的修改是一致的创建一个非热状态，亚稳态的ps时标，泵诱导的脉冲修改后的电子相互作用。
英文摘要：
Time-and-frequency resolved pump-probe optical spectroscopy is used to investigate the effect of the impulsive injection of delocalized excitations through a charge-transfer process in insulating CuGeO3. A large broadening of the charge-transfer edge is observed on the sub-ps timescale. The modification of this spectral feature can not be attributed to the local increase of the effective temperature, as a consequence of the energy absorbed by the pump pulse. The measured modifications of the optical properties of the system are consistent with the creation of a non-thermal state, metastable on the ps timescale, after the pump-induced impulsive modification of the electron interactions.
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