Femtosecond core-level photoemision spectroscopy on 1T-TaS2 using a 60-eV laser source
Femtosecond core-level photoemision spectroscopy on 1T-TaS2 using a 60-eV laser source
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DOI：
10.1103/physrevb.83.081104
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发表时间：
2011-02-23
影响因子：
3.7
通讯作者：
Shin, S.
中科院分区：
文献类型：
--
作者：
Ishizaka, K.;Kiss, T.;Shin, S.
时间分辨光电子能谱(TrPES)可以直接探测瞬变电子结构，因此在阐明凝聚态物质中的非平衡过程方面具有广阔的应用前景。本文报道了在1T-TaS_2上实现芯级trPES的结果，它是通过研制高强度60 eV高次谐波激光器来实现的。Ta4f芯级trPES通过对Ta电子的选择性和实时观测，提供电荷密度波(CDW)的瞬时幅度。结果表明，在Ta原子之间的电子转移过程中，伴随着超快的光致熔化和CDW振幅的恢复，伴随着特殊的长寿命振荡(即集体振幅激发)。核心级的trPES为研究光相关现象中的超快原子特定电子动力学提供了广泛的机会。
Time-resolved photoelectron spectroscopy (trPES) can directly detect transient electronic structure, thus bringing out its promising potential to clarify nonequilibrium processes arising in condensed matters. Here we report the result of core-level trPES on 1T-TaS2, realized by developing a high-intensity 60-eV laser obtained by high-order harmonic generation. Ta4f core-level trPES offers the transient amplitude of the charge-density wave (CDW), via the site-selective and real-time observation of Ta electrons. The present result indicates an ultrafast photoinduced melting and recovery of CDW amplitude, followed by a peculiar long-life oscillation (i.e., collective amplitudon excitation) accompanying the transfer of electrons among adjacent Ta atoms. core-level trPES offers a broad range of opportunities for investigating the ultrafast atom-specific electron dynamics in photorelated phenomena of interest.