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

S. Sakamoto; N. Gauthier; P. S. Kirchmann; J. A. Sobota; Z.-X. Shen

doi:10.1103/PhysRevB.105.L161107

Letter

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

S. Sakamoto ^1,*, N. Gauthier ¹, P. S. Kirchmann ¹, J. A. Sobota ^1,†, and Z.-X. Shen ^1,2

¹Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
²Geballe Laboratory for Advanced Materials, Department of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA

^*shoya.sakamoto@issp.u-tokyo.ac.jp
^†sobota@stanford.edu

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Phys. Rev. B 105, L161107 – Published 27 April, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L161107

Abstract

We report time- and angle-resolved photoemission spectroscopy (trARPES) measurements on the Sb(111) surface. We observe band- and momentum-dependent binding-energy oscillations in the bulk and surface bands driven by $A_{1 g}$ and $E_{g}$ coherent phonons. While the bulk band shows simultaneous $A_{1 g}$ and $E_{g}$ oscillations, the surface bands show either $A_{1 g}$ 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 tied to lattice vibration and confirms that band-, momentum-, and mode-dependent electron-phonon coupling can indeed be probed by trARPES in the low fluence limit.

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

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

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