Nonequilibrium electronic and phonon dynamics of Cu0.17Bi2Se3 investigated by core-level and valence-band time-resolved photoemission spectroscopy
Nonequilibrium electronic and phonon dynamics of Cu0.17Bi2Se3 investigated by core-level and valence-band time-resolved photoemission spectroscopy
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通过核能级和价带时间分辨光电子能谱研究 Cu0.17Bi2Se3 的非平衡电子和声子动力学
DOI：
10.1103/physrevb.92.121106
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and S. Shin
中科院分区：
文献类型：
--
作者：
T. Yamamoto;Y. Ishida;R. Yoshida;M. Okawa;K. Okazaki;T. Kanai;A. Kikkawa;Y. Taguchi;T. Kiss;K. Ishizaka;N. Ishii;J. Itatani;S. Watanabe;Y. Tokura;T. Saitoh;and S. Shin
利用时间分辨（TR）芯能级和价带角分辨（AR）光电子能谱（PES）研究了电子掺杂拓扑绝缘体的超快动力学。Biline由一个单峰组成，在加热和泵浦时都表现出展宽，我们解释为声子温度的变化（），在表面区域。另一方面，电子动力学和电子温度（）用近TRARPES测定。由堆芯级TRPES计算的瞬态温度与由近TRARPES计算的瞬态温度具有相似的特性。和的这种类似行为不能用一个简单的双温度模型来再现，但可以用一个修正的模型来再现，尽管我们不能排除芯能级加宽也反映了这种可能性。
We have performed time-resolved (TR) core-level and valence-band angle-resolved (AR) photoemission spectroscopy (PES) to investigate ultrafast dynamics of an electron-doped topological insulator. The Biline was composed of a single peak and exhibited broadening upon both heating and pumping, which we interpreted as a change of phonon temperature (), in the surface region. The electronic dynamics and electron temperature (), on the other hand, were determined with near-TRARPES. The transient temperature deduced from core-level TRPES shows a similar behavior withdeduced from near-TRARPES. This similar behavior ofandcan be reproduced not by a simple two-temperature model but by amodifiedone, although we cannot exclude a possibility that core-level broadening also reflects.