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[CM ICTP - Trieste]

CONDENSED MATTER SECTION

	
SEMINAR on Disorder and strong electron correlations




Thursday, 8 November   -    11:00 a.m.



Seminar Room,  Main Bldg.- first floor




D. BASKO   ( SISSA - Trieste )

"Interplay of Coulomb and electron-phonon interactions in graphene"

Abstract

Electron-phonon coupling in graphene is currently a subject of intense 
research.  Theoretically, the coupling constants are usually calculated 
using density-functional theory (DFT), where the exchange (Fock) term 
is treated in the local density approximation, or the generalized 
gradient approximation.
In this work we consider mutual effect of weak electron-phonon and 
strong Coulomb interactions on each other by summing up leading 
logarithmic corrections via the renormalization group approach, which 
goes beyond Hartree-Fock approximation.  We find that coupling 
constants to different phonon modes are renormalized differently, which 
explains the experimentally observed intensities of Raman peaks.