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

TL;DR

This study uses time- and angle-resolved photoemission spectroscopy to explore how coherent phonons influence electron-phonon interactions on the Sb(111) surface, revealing band- and momentum-dependent oscillations.

Contribution

It demonstrates the connection between electron-phonon coupling and coherent phonon-induced binding energy oscillations using experimental and theoretical methods.

Findings

Bulk bands show simultaneous $A_{1g}$ and $E_{g}$ oscillations.

Surface bands exhibit either $A_{1g}$ or $E_{g}$ oscillations.

The behavior is reproduced by density-functional theory calculations.

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.