How fast can a Peierls-Mott insulator be melted?
How fast can a Peierls-Mott insulator be melted?
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DOI：
10.1039/c4fd00042k
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发表时间：
2014-11
影响因子：
3.4
通讯作者：
C. Sohrt;A. Stange;M. Bauer;K. Rossnagel
中科院分区：
文献类型：
--
作者：
C. Sohrt;A. Stange;M. Bauer;K. Rossnagel
利用时间和角度分辨的极紫外光电子能谱直接测定了1 T-TaS（2）和1 T-TaSe（2）层状绝缘体在亚300 fs时间尺度上动量相关的电子结构动力学。提取的光谱顺序参数显示一个全球性的两个时间尺度的动态表示准瞬时损失的电子订单和随后的相干抑制的晶格畸变的时间尺度上的电荷密度波振幅模式的频率。经过一个半周期的相干振幅模式振动，绝缘体和金属之间的交叉状态与部分填充和部分关闭的莫特和佩尔斯间隙达到。在更广泛的背景下，在复杂的材料中的电子顺序淬火的结果进行了讨论。
Time- and angle-resolved extreme ultraviolet photoemission spectroscopy is used to directly determine the momentum-dependent electronic structure dynamics in the layered Peierls-Mott insulators 1T-TaS(2) and 1T-TaSe(2) on the sub-300 fs time scale. Extracted spectroscopic order parameters display a global two-time-scale dynamics indicating a quasi-instantaneous loss of the electronic orders and a subsequent coherent suppression of the lattice distortion on a time scale related to the frequency of the charge-density-wave amplitude mode. After one half-cycle of coherent amplitude-mode vibration, a crossover state between insulator and metal with partially filled-in and partially closed Mott and Peierls gaps is reached. The results are discussed within the wider context of electronic order quenching in complex materials.