Possible observation of parametrically amplified coherent phasons in K0.3MoO3 using time-resolved extreme-ultraviolet angle-resolved photoemission spectroscopy
Possible observation of parametrically amplified coherent phasons in K0.3MoO3 using time-resolved extreme-ultraviolet angle-resolved photoemission spectroscopy
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DOI：
10.1103/physrevb.88.045104
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发表时间：
2013-07-02
影响因子：
3.7
通讯作者：
Cavalleri, A.
中科院分区：
文献类型：
--
作者：
Liu, H. Y.;Gierz, I.;Cavalleri, A.
我们利用极紫外光下的时间和角度分辨光电子能谱测量了K0.3MoO_3的时间和动量相关的电子结构。电荷密度波凝聚体的迅速耗尽启动了振幅模式的相干振荡，观察到的是键合带位置的1.7太赫兹频率调制。相反，反键带的振荡频率大约是这个频率的一半。我们将这些振荡归因于通过位相涨落的参数放大而引起的相子的相干激发。
We use time-and angle-resolved photoemission spectroscopy in the extreme ultraviolet to measure the time- and momentum-dependent electronic structures of photoexcited K0.3MoO3. Prompt depletion of the charge-density wave condensate launches coherent oscillations of the amplitude mode, observed as a 1.7-THz-frequency modulation of the bonding band position. In contrast, the antibonding band oscillates at about half this frequency. We attribute these oscillations to coherent excitation of phasons via parametric amplification of phase fluctuations.