Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3

doi:10.1038/srep13213

	Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3
	Zhu, Siyuan 1; Ishida, Yukiaki 2; Kuroda, Kenta 1; Sumida, Kazuki 1; Ye, Mao 3; Wang, Jiajia4 ; Pan, Hong 5,6; Taniguchi, Masaki 1; Qiao, Shan3,4 ; Shin, Shik 2; Kimura, Akio 1
	2015-08-21
发表期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
卷号	5
发表状态	已发表
DOI	10.1038/srep13213
摘要	Topological insulators (TIs) are a new quantum state of matter. Their surfaces and interfaces act as a topological boundary to generate massless Dirac fermions with spin-helical textures. Investigation of fermion dynamics near the Dirac point (DP) is crucial for the future development of spintronic devices incorporating topological insulators. However, research so far has been unsatisfactory because of a substantial overlap with the bulk valence band and a lack of a completely unoccupied DP. Here, we explore the surface Dirac fermion dynamics in the TI Sb2Te3 by time- and angle-resolved photoemission spectroscopy (TrARPES). Sb2Te3 has an in-gap DP located completely above the Fermi energy (EF). The excited electrons in the upper Dirac cone stay longer than those below the DP to form an inverted population. This was attributed to a reduced density of states (DOS) near the DP.
收录类别	SCI
语种	英语
资助项目	JSPS[23340105] ; JSPS[26800165]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000359843000001
出版者	NATURE PUBLISHING GROUP
WOS关键词	SURFACE-STATES ; CONE
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/2153
专题	物质科学与技术学院物质科学与技术学院_特聘教授组_乔山组物质科学与技术学院_科学装置(X)_同步辐射项目
通讯作者	Zhu, Siyuan
作者单位	1.Hiroshima Univ, Grad Sch Sci, Hiroshima 7398526, Japan 2.Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan 3.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 4.Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China 5.Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China 6.Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Siyuan,Ishida, Yukiaki,Kuroda, Kenta,et al. Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3[J]. SCIENTIFIC REPORTS,2015,5.
APA	Zhu, Siyuan.,Ishida, Yukiaki.,Kuroda, Kenta.,Sumida, Kazuki.,Ye, Mao.,...&Kimura, Akio.(2015).Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3.SCIENTIFIC REPORTS,5.
MLA	Zhu, Siyuan,et al."Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3".SCIENTIFIC REPORTS 5(2015).