Connection between coherent phonons and electron-phonon coupling in Sb (111)

Abstract

We report time- and angle-resolved photoemission spectroscopy measurements on the Sb(111) surface. We observe band- and momentum-dependent binding-energy oscillations in the bulk and surface bands driven by $A_{1g}$ and $E_g$ coherent phonons. While the bulk band shows simultaneous $A_{1g}$ and $E_g$ oscillations, the surface bands show either $A_{1g}$ or $E_g$ oscillations. The observed behavior is reproduced by frozen-phonon calculations based on density-functional theory. This evidences the connection between electron-phonon coupling and coherent binding energy dynamics.