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23 April 2024 |
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Article overview
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Quasiparticle Dynamics in Reshaped Helical Dirac Cone of Topological Insulators | | Lin Miao
; Z. F. Wang
; Wenmei Ming
; Meng-Yu Yao
; Meixiao Wang
; Fang Yang
; Y. R. Song
; Fengfeng Zhu
; Alexei V. Fedorov
; Z. Sun
; C. L. Gao
; Canhua Liu
; Qi-Kun Xue
; Chao-Xing Liu
; Feng Liu
; Dong Qian
; Jin-Feng Jia
; | | Date: |
25 Feb 2013 | | Abstract: | Topological insulators (TIs) and graphene present two unique classes of
materials which are characterized by spin polarized (helical) and non-polarized
Dirac-cone band structures, respectively. The importance of many-body
interactions that renormalize the linear bands near Dirac point in graphene has
been well recognized and attracted much recent attention. However,
renormalization of the helical Dirac point has not been observed in TIs. Here,
we report the experimental observation of the renormalized quasi-particle
spectrum with a skewed Dirac cone in a single Bi bilayer grown on Bi2Te3
substrate, from angle-resolved photoemission spectroscopy. First-principles
band calculations indicate that the quasi-particle spectra are likely
associated with the hybridization between the extrinsic substrate-induced Dirac
states of Bi bilayer and the intrinsic surface Dirac states of Bi2Te3 film at
close energy proximity. Without such hybridization, only single-particle Dirac
spectra are observed in a single Bi bilayer grown on Bi2Se3, where the
extrinsic Dirac states Bi bilayer and the intrinsic Dirac states of Bi2Se3 are
well separated in energy. The possible origins of many-body interactions are
discussed. Our findings provide a means to manipulate topological surface
states. | | Source: | arXiv, 1302.5998 | | Services: | Forum | Review | PDF | Favorites | |
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