Ultrafast surface Dirac fermion dynamics of Sb2Te3-based topological insulators

IF 8.7 2区 工程技术 Q1 CHEMISTRY, PHYSICAL Progress in Surface Science Pub Date : 2021-05-01 DOI:10.1016/j.progsurf.2021.100628
Kazuki Sumida , Yukiaki Ishida , Jens Güdde , Ulrich Höfer , Shik Shin , Akio Kimura
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引用次数: 3

Abstract

Topological insulators (TIs) characterized by gapless and spin-polarized conical band dispersion on their surfaces have been extensively studied over the last decade. This article reviews our recent works on ultrafast carrier dynamics of Sb2Te3-based nonmagnetic and magnetic TIs by utilizing state-of-the-art femtosecond time- and angle-resolved photoelectron spectroscopy. We have demonstrated that the electronic recovery time elongated from a few ps to >400 ps in case that the Dirac point was close to the Fermi energy in the series of (Sb1-xBix)2Te3. We also investigated how the magnetic-impurity affects the carrier dynamics in ferromagnetic Sb2-yVyTe3. It was found that the electronic recovery time drastically shortened from a few ps to <500 fs with increasing vanadium concentration. Since the lifetime of the nonequilibrated surface Dirac fermions can range from femto- to nano-second, Sb2Te3-based TIs would be promising for ultrafast spin switching and spin-polarized current generation device applications.

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sb2te3基拓扑绝缘体的超快表面狄拉克费米子动力学
在过去的十年中,以无间隙和自旋极化圆锥带色散为特征的拓扑绝缘子(TIs)得到了广泛的研究。本文综述了近年来利用飞秒时间和角度分辨光电子能谱技术研究sb2te3基非磁性和磁性ti的超快载流子动力学的研究进展。我们已经证明,当狄拉克点接近(Sb1-xBix)2Te3系列中的费米能量时,电子恢复时间从几ps延长到> 400ps。我们还研究了磁性杂质如何影响铁磁性Sb2-yVyTe3的载流子动力学。随着钒浓度的增加,电子恢复时间从几ps急剧缩短到500 fs。由于非平衡表面狄拉克费米子的寿命可以从飞秒到纳秒不等,因此基于sb2te3的ti将有希望用于超快自旋开关和自旋极化电流产生器件。
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来源期刊
Progress in Surface Science
Progress in Surface Science 工程技术-物理:凝聚态物理
CiteScore
11.30
自引率
0.00%
发文量
10
审稿时长
3 months
期刊介绍: Progress in Surface Science publishes progress reports and review articles by invited authors of international stature. The papers are aimed at surface scientists and cover various aspects of surface science. Papers in the new section Progress Highlights, are more concise and general at the same time, and are aimed at all scientists. Because of the transdisciplinary nature of surface science, topics are chosen for their timeliness from across the wide spectrum of scientific and engineering subjects. The journal strives to promote the exchange of ideas between surface scientists in the various areas. Authors are encouraged to write articles that are of relevance and interest to both established surface scientists and newcomers in the field.
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