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<!--StartFragment--><p class="MsoNormal" align="center" style="text-align:center;tab-stops:22.5pt"><b><span style="font-family: 'Times New Roman'; font-size: 14px;">24<sup>th</sup> Annual Richard C. Lord Lecture</span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-family: 'Times New Roman';">Paul
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Fast:<o:p></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-family: 'Times New Roman';">Probing
carriers and vibrations <o:p></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-family: 'Times New Roman';">in 1D and
2D materials</span></b><span style="font-family: 'Times New Roman';"> </span></p>
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<!--StartFragment--><p class="MsoNormal" style="text-align:justify">One and two dimensional materials are arguably the most interesting new
materials systems to arise over the past two decades. First, electrons confined
to a plane or a line have quantized energy levels and band structures that are
quite different than their three-dimensional counterparts. In addition their mechanical properties are
dramatically modified, with transverse bending and thermal vibrational modes
influencing basic materials properties in ways that are normally only seen in
soft matter systems. But because of their diminutive size, these materials
present particular challenges for measurement. As an example, a single nanotube
or graphene sheet might only scatter 10<sup>-4 </sup>of the photons incident
upon it, yet we wish to resolve information with <i>nm</i> spatial and <i>p</i>s
temporal resolution. Here, we will discuss a number of unusual approaches to
meet these challenges. First, we will discuss ultrafast photocurrent
measurements that reveal the fundamental thermal relaxation processes for
excited electrons. Next, we will discuss how circularly polarized light probes
the “valley” polarization in a 2D semiconductor, leading to a Hall effect in
the absence of a magnetic field. Finally, we will discuss experiments probing
the static and dynamic physical fluctuations of graphene and carbon nanotubes
using a combination of electronic and optical measurements, with implications
for everything from nonlinear processes in nanoscale resonators to the
fundamental bending stiffness of graphene. <o:p></o:p></p>
<!--EndFragment--><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';">Tuesday, April 28, 2015<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';">12:00-1:00 p.m.</span><span style="font-family: 'Times New Roman';"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';">Grier Room (34-401)<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';">Refreshments served
following the seminar<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family: 'Times New Roman'; font-size: 14px;"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman'; font-size: 14px;"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman'; font-size: 14px;"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman'; font-size: 14px;">Sponsored by George R. Harrison
Spectroscopy Laboratory,<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman'; font-size: 14px;">and the Department of
Chemistry,<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-family: 'Times New Roman';"><span style="font-size: 14px;">Massachusetts Institute
of Technology</span><span style="font-size: 16pt;"><o:p></o:p></span></span></p>
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