Quasiparticle Dynamics in Reshaped Helical Dirac Cone of Topological Insulators

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.

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Cited by in corpus (37)

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• Formation of quantum spin Hall state on Si surface and energy gap scaling with strength of spin orbit coupling
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• Excitonic pairing and insulating transition in two-dimensional semi-Dirac semimetals
• Effects of the Dirac cone tilt in two-dimensional Dirac semimetal
• Intra- and Interband Electron Scattering in the Complex Hybrid Topological Insulator Bismuth Bilayer on Bi${}_2$Se${}_3$
• Modeling Near-Surface Bound Electron States in Three-Dimensional Topological Insulator: Analytical and Numerical Approaches
• Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer
• Probing the Origin of Extreme Magnetoresistance in Pr/Sm Mono-Antimonides/Bismuthides
• Orbit- and Atom-Resolved Spin Textures of Intrinsic, Extrinsic and Hybridized Dirac Cone States
• Instability of the topological surface state in Bi${}_2$Se${}_3$ upon deposition of gold
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• Interfacing Quantum Spin Hall and Quantum Anomalous Hall insulators: Bi bilayer on MnBi${}_2$Te${}_4$-family materials
• Inducing anisotropies in Dirac fermions by periodic driving
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• Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air
• Scanning Tunneling Microscope Tip-Induced Formation of Bi Bilayers on Bi${}_2$Te${}_3$
• Atomically Abrupt Topological p-n Junction
• Emergence of a weak topological insulator from the Bi${}_x$Se${}_y$ family and the observation of weak anti-localization
• Halogen adsorption and reaction with Bi${}_2$(Se,Te)${}_3$ and Bi/Bi${}_2$(Se,Te)${}_3$
• Tuning Transport Properties of Topological Edge States of Bi(111) Bilayer Film by Edge Adsorption