We report the temperature-dependent band structure and energy dependence of the electron-phonon interaction of the topological surface state (TSS) on the three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Te}}_3$ using angle-resolved photoemission spectroscopy. Despite the nonrigid-band-like band modification as the temperature increases, the degeneracy at the Dirac point (DP) was robust, indicating topological protection. The electron-phonon coupling parameter depends on the initial-state electron energy, varying from 0.13 (at the DP) to 0.02 (100 meV above the DP), in agreement with reported first-principles calculations. Our findings provide insight into the physical properties derived from TSSs at finite temperatures.

Close

PrevNext

View figure in article

• Band gap
• Electron-phonon coupling
• Electronic structure
• Lifetimes & widths
• Surface states
• Symmetry protected topological states
• Temperature
• Single crystal materials
• Topological insulators
• Photoemission spectroscopy