Tuning the Electron-Phonon Coupling in Multilayer Graphene with Magnetic Fields

Electric field effect tuning of electron-phonon coupling in graphene.

Gate-modulated low-temperature Raman spectra reveal that the electric field effect (EFE), pervasive in contemporary electronics, has marked impacts on long-wavelength optical phonons of graphene. The EFE in this two-dimensional honeycomb lattice of carbon atoms creates large density modulations of carriers with linear dispersion (known as Dirac fermions). Our EFE Raman spectra display the inter...

Anisotropic Eliashberg function and electron-phonon coupling in doped graphene

D. Haberer,1,2 L. Petaccia,3 A. V. Fedorov,1,4 C. S. Praveen,5 S. Fabris,5 S. Piccinin,5 O. Vilkov,4,6 D. V. Vyalikh,4,6 A. Preobrajenski,7 N. I. Verbitskiy,8,9 H. Shiozawa,8 J. Fink,1 M. Knupfer,1 B. Büchner,1 and A. Grüneis1,8 1IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany 2Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA 3Elettra Sincrotr...

Doped graphene as tunable electron-phonon coupling material.

We present a new way to tune the electron-phonon coupling (EPC) in graphene by changing the deformation potential with electron/hole doping. We show the EPC for highest optical branch at the high symmetry point K acquires a strong dependency on the doping level due to electron-electron correlation not accounted in mean-field approaches. Such a dependency influences the dispersion (with respect ...

Tuning Correlation Effects with Electron–Phonon Interactions

Unconventional plasmon-phonon coupling in graphene

We predict the existence of coupled plasmon-phonon excitations in graphene by using the self-consistent linear response formalism. The unique electron-phonon interaction in graphene leads to unconventional mixing of plasmon and optical phonon polarizations. We find that longitudinal plasmons couple exclusively to transverse optical phonons, whereas graphene’s transverse plasmons couple only to ...