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In this letter we report measurements of the coupling between Dirac fermionquasiparticles (DFQs) and phonons on the (001) surface of the strongtopological insulator Bi2Se3. While most contemporary investigations of thiscoupling have involved examining the temperature dependence of the DFQself-energy via angle-resolved photoemission spectroscopy (ARPES) measurements,we employ inelastic helium atom scattering to explore, for the first time, thiscoupling from the phonon perspective. Using a Hilbert transform, we are able toobtain the imaginary part of the phonon self-energy associated with adispersive surface phonon branch identified in our previous work [1] as havingstrong interactions with the DFQs. From this imaginary part of the self-energywe obtain a branch-specific electron-phonon coupling constant of 0.43, which isstronger than the values reported form the ARPES measurements.

Electron-phonon Coupling on the Surface of the Topological Insulator Bi2Se3: Determined from Surface Phonon Dispersion Measurements