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

Journal Article (Journal Article)

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 Deff(ac)≃5  eV. This value is in accord with recent theoretical predictions but differs from those extracted using electrical transport measurements.

Full Text

Duke Authors

Cited Authors

  • Roberts, AT; Binder, R; Kwong, NH; Golla, D; Cormode, D; LeRoy, BJ; Everitt, HO; Sandhu, A

Published Date

  • May 8, 2014

Published In

Volume / Issue

  • 112 / 18

Start / End Page

  • 187401 -

PubMed ID

  • 24856720

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.112.187401


  • eng