Charge and structural dynamics in the photoinduced phase transition process of (EDO-TTF)_2PF_6 studied by picosecond time-resolved vibrational spectroscopy
Charge and structural dynamics in the photoinduced phase transition process of (EDO-TTF)_2PF_6 studied by picosecond time-resolved vibrational spectroscopy
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皮秒时间分辨振动光谱研究(EDO-TTF)_2PF_6光致相变过程中的电荷和结构动力学
DOI：
10.1021/jp210708q
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K.Onda
中科院分区：
文献类型：
--
作者：
N.Fukazawa;M.Shimizu;T.Ishikawa;Y.Okimoto;S.Koshihara;T.Hiramatsu;Y.Nakano;H.Yamochi;G.Saito;K.Onda
利用时间分辨近红外反射光谱和时间分辨中红外振动光谱，我们研究了电荷转移复合物(EDO-TTF)2PF6(EDO-TTF：乙二氧基四硫富瓦烯)中电荷有序绝缘相在光激发后百皮秒范围内的光致相变。 0.83-1.03 eV 的时间分布是光激发后立即发生的光致电荷不成比例相的特征，表明在百皮秒范围内形成了新的亚稳态相。 1300–1700 cm–1 处的时间分辨振动光谱，即电荷和结构敏感的 CC 伸缩振动模式所在的位置，阐明了新相的性质与高温金属相的性质非常接近，并且伴随着电荷和结构波动，新相的出现大约需要 100 ps。
Using time-resolved near-infrared reflectance spectroscopy and time-resolved mid-infrared vibrational spectroscopy, we studied photoinduced phase transition of the charge-ordered insulating phase in a charge-transfer complex (EDO-TTF)2PF6(EDO-TTF: ethylenedioxy-tetrathiafulvalene) in the hundred picosecond range after photoexcitation. The temporal profiles at 0.83–1.03 eV, which are a characteristic of the photoinduced charge-disproportionate phase immediately after photoexcitation, suggested the formation of a new metastable phase in the hundred picosecond range. Time-resolved vibrational spectra at 1300–1700 cm–1, where charge- and structure-sensitive CC stretching vibrational modes are located, elucidated that the nature of the new phase is very close to that of the high-temperature metallic phase and it takes about 100 ps for the new phase to emerge accompanied with charge and structure fluctuation.