Disentanglement of the Electronic and Lattice Parts of the Order Parameter in a 1D Charge Density Wave System Probed by Femtosecond Spectroscopy
Disentanglement of the Electronic and Lattice Parts of the Order Parameter in a 1D Charge Density Wave System Probed by Femtosecond Spectroscopy
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DOI：
10.1103/physrevlett.105.066402
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发表时间：
2010-08-04
影响因子：
8.6
通讯作者：
Demsar, J.
中科院分区：
文献类型：
--
作者：
Schaefer, H.;Kabanov, V. V.;Demsar, J.
报道了利用时间分辨光谱学对准一维电荷密度波(CDW)化合物K(0.3)MoO(3)中Q=0声子谱随温度(T)变化的高分辨率研究。出现在T(C)下方的许多模式显示了它们的幅度、频率和阻尼值明显的T依赖关系。利用含时Ginzburg-Landau理论，我们证明了这些模式是序参数的电子部分与2k(F)声子的线性耦合的结果，而(电子)CDW振幅模式是过抑制的。
We report on the high resolution studies of the temperature (T) dependence of the q = 0 phonon spectrum in the quasi-one-dimensional charge density wave (CDW) compound K(0.3)MoO(3) utilizing time-resolved optical spectroscopy. Numerous modes that appear below T(c) show pronounced T dependences of their amplitudes, frequencies, and dampings. Utilizing the time-dependent Ginzburg-Landau theory we show that these modes result from linear coupling of the electronic part of the order parameter to the 2k(F) phonons, while the (electronic) CDW amplitude mode is overdamped.