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

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Abstract

Topological insulators and graphene present two unique classes of materials, which are characterized by spin-polarized (helical) and nonpolarized 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 topological insulators. Here, we report the experimental observation of the renormalized quasiparticle spectrum with a skewed Dirac cone in a single Bi bilayer grown on Bi2Te3 substrate fromangle-resolved photoemission spectroscopy. First-principles band calculations indicate that the quasiparticle 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.

Original languageEnglish (US)
Pages (from-to)2758-2762
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number8
DOIs
StatePublished - Feb 19 2013

All Science Journal Classification (ASJC) codes

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    Miao, L., Wang, Z. F., Ming, W., Yao, M. Y., Wang, M., Yang, F., Song, Y. R., Zhu, F., Fedorov, A. V., Sun, Z., Gao, C. L., Liu, C., Xue, Q. K., Liu, C. X., Liu, F., Qian, D., & Jia, J. F. (2013). Quasiparticle dynamics in reshaped helical Dirac cone of topological insulators. Proceedings of the National Academy of Sciences of the United States of America, 110(8), 2758-2762. https://doi.org/10.1073/pnas.1218104110