Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3
Zhu, Siyuan1; Ishida, Yukiaki2; Kuroda, Kenta1; Sumida, Kazuki1; Ye, Mao3; Wang, Jiajia4; Pan, Hong5,6; Taniguchi, Masaki1; Qiao, Shan3,4; Shin, Shik2; Kimura, Akio1
AbstractTopological 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.
Indexed BySCI
Funding ProjectJSPS[23340105] ; JSPS[26800165]
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000359843000001
Original Document TypeArticle
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Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhu, Siyuan
Affiliation1.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
Recommended Citation
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).
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