Anisotropic effect of warping on the lifetime broadening of topological surface states in angle-resolved photoemission from Bi${}_2$Te${}_3$

Abstract

We analyze the strong hexagonal warping of the Dirac cone of Bi${}_2$Te${}_3$ by angle-resolved photoemission. Along $\overline{\Gamma }$$\overline{\mathrm{M}}$, the dispersion deviates from a linear behavior meaning that the Dirac cone is warped outwards and not inwards. We show that this introduces an anisotropy in the lifetime broadening of the topological surface state which is larger along $\overline{\Gamma }$$\overline{\mathrm{K}}$. The result is not consistent with nesting. Based on the theoretically predicted behavior of the ground-state spin texture of a strongly warped Dirac cone, we propose spin-dependent scattering processes as explanation for the anisotropic scattering rates. These results could help paving the way for optimizing future spintronic devices using topological insulators and controlling surface-scattering processes via external gate voltages.

arXiv comment12 pages, 5 figures

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• Landau level spectroscopy of Bi${}_2$Te${}_3$
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• Role of matrix elements in the time-resolved photoemission signal
• Ultrafast Evolution of Bulk, Surface and Surface Resonance States in Photoexcited Bi${}_2$Te${}_3$
• Lifetime and surface-to-bulk scattering off vacancies of the topological surface state in the three-dimensional strong topological insulators Bi2Te3 and Bi2Se3
• Unidirectional valley-contrasting photo-current in strained transition metal dichalcogenide monolayers
• Observation of anisotropic Dirac cones in the topological material Ti2Te2P
• The anomalous spin texture as the probe for interactions in $B{i}_{2-y}S{b}_{y}S{e}_{x}T{e}_{3-x}$
• Interaction Approach to Anomalous Spin Texture in Warped Topological Insulators
• Topological layered n-type thermoelectrics based on bismuth telluride solid solutions
• Scanning tunneling spectroscopy of the surface states of Dirac fermions in thermoelectrics based on bismuth telluride