Home Todos os Eventos Details - Marcos Assunção Pimenta (UFMG)

EMail Print

Todos os Eventos

Event 

Title:
Marcos Assunção Pimenta (UFMG)
When:
03.06.2009 16.00 h - 17.30 h
Where:
Auditório 201 - Niterói
Category:
Colóquios

Description

Investigating electrons, phonons and electron-phonon interactions in graphene by Raman spectroscopy

We will first show that Resonance Raman spectroscopy is a very useful tool to investigate electrons and phonons near the Dirac point of graphenes due to the specific double resonance (DR) Raman process that occur in these materials. We have performed recent investigations of monolayer and bilayer graphene using this methodology and we were able to determine the tight-binding parameters that describe the electronic dispersions of these materials. Our results reveal a significant asymmetry between the electronic dispersion in the valence and conduction bands of bilayer graphene. The special process of electron-phonon interaction that renormalizes the phonon energy giving rise to the Kohn anomaly will be discussed, and illustrated by gated experiments where the position of the Fermi level can be changed.

coloquio-pimenta-2009

Venue

Map
Group:
Auditório 201
Street:
Av. Litorânea
ZIP:
24210-346
City:
Niterói
State:
RJ
Country:
Country: br

Description

Sorry, no description available
<<  Oct 19  >>
 Su  Mo  Tu  We  Th  Fr  Sa 
    1  2  3  4  5
  6  7  8  9101112
13141516171819
202123242526
2728293031