<!doctype html public "-//W3C//DTD W3 HTML//EN">
<html><head><style type="text/css"><!--
blockquote, dl, ul, ol, li { padding-top: 0 ; padding-bottom: 0 }
--></style><title>April 21, 2009</title></head><body>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Seminar on</b></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b><br></b></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Modern Optics and Spectroscopy</b></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b><br></b></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b><br></b></font></div>
<div align="center"><font face="Arial"
color="#000000"><i><b>Electron-phonon interactions in carbon nanotubes
studied by Raman spectroscopy</b></i></font></div>
<div align="center"><font face="Arial"
color="#000000"><i><b><br></b></i></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Hootan Farhat</b>, MIT</font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman"
color="#000000">Tuesday, April 21, 2009</font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman" color="#000000">12:00
- 1:00 p.m.</font></div>
<div align="center"><font face="Times"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman" color="#000000">The
unique electronic properties of carbon nanotubes (CNTs) make them a
viable</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">contender for future generation electronic components
such as transistors and</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">electrical interconnects. The feasibility of
this technology depends on many</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">factors, one of which is the scattering of electrons
by room temperature</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">lattice phonons. The reduced dimensionality of
CNTs can lead to a different</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">interaction between electrons and phonons than in the
bulk. In this talk we</font></div>
<div align="center"><font face="Times New Roman" color="#000000">show
that the Raman spectrum of carbon nanotubes is rich in information
about</font></div>
<div align="center"><font face="Times New Roman" color="#000000">the
elecron-phonon interaction. We will present measurements on
individual</font></div>
<div align="center"><font face="Times New Roman" color="#000000">CNTs
in which we can control the Fermi level and the current passing
through</font></div>
<div align="center"><font face="Times New Roman" color="#000000">the
nanotube during the Raman measurement. We will discuss phonon
softening in</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">metallic CNTs, doping induced structural deformations,
and electrical heating of</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">individual CNTs.</font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><br></font></div>
<div align="center"><font face="Times New Roman" color="#000000">Grier
Room, MIT Bldg 34-401</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">Refreshments served after the lecture</font></div>
</body>
</html>