Optical characterization of electron-phonon interactions at the saddle point in graphene

Adam T. Roberts, Rolf Binder, Nai H. Kwong, Dheeraj Golla, Daniel Cormode, Brian J. Leroy, Henry O. Everitt, Arvinder Sandhu

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The role of many-body interactions is experimentally and theoretically investigated near the saddle point absorption peak of graphene. The time and energy-resolved differential optical transmission measurements reveal the dominant role played by electron-acoustic phonon coupling in band structure renormalization. Using a Born approximation for electron-phonon coupling and experimental estimates of the dynamic lattice temperature, we compute the differential transmission line shape. Comparing the numerical and experimental line shapes, we deduce the effective acoustic deformation potential to be Deffac≃5eV. This value is in accord with recent theoretical predictions but differs from those extracted using electrical transport measurements.

Original languageEnglish (US)
Article number187401
JournalPhysical review letters
Volume112
Issue number18
DOIs
StatePublished - May 8 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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