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.