Ultrafast collective dynamics in the charge-density-wave conductor K(0.3)MoO(3).
Ultrafast collective dynamics in the charge-density-wave conductor K(0.3)MoO(3).
复制标题
电荷密度波导体 K(0.3)MoO(3) 中的超快集体动力学。
DOI：
10.1063/1.1645785
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
G. Lupke
中科院分区：
文献类型：
--
作者：
Yuhang Ren;Zhu;G. Lupke
用飞秒泵浦探测光谱研究了蓝青铜(K（0.3)MoO(3)）和红青铜(K（0.33)MoO(3)）中低能相干电荷密度波的激发。在K(0.33)MoO(3)中观察到具有明显各向异性的横向相的线性无间隙、类声色散关系。在30k时，振幅模式表现出微弱的色散关系，频率为1.67太赫兹。我们的结果首次表明，时间分辨光学技术提供了强相关电子系统中集体激发的动量分辨。
Low-energy coherent charge-density wave excitations are investigated in blue bronze (K(0.3)MoO(3)) and red bronze (K(0.33)MoO(3)) by femtosecond pump-probe spectroscopy. A linear gapless, acousticlike dispersion relation is observed for the transverse phasons with a pronounced anisotropy in K(0.33)MoO(3). The amplitude mode exhibits a weak (opticlike) dispersion relation with a frequency of 1.67 THz at 30 K. Our results show for the first time that the time-resolved optical technique provides momentum resolution of collective excitations in strongly correlated electron systems.