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<td>Physics Colloquium & Condensed Matter Seminar</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Mon, 27 Apr 2015 19:24:40 +0000</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Wilkinson, Eleonor V <a class="moz-txt-link-rfc2396E" href="mailto:evwilk@wm.edu"><evwilk@wm.edu></a></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td>'<a class="moz-txt-link-abbreviated" href="mailto:physics0607@physics.wm.edu">physics0607@physics.wm.edu</a>'
<a class="moz-txt-link-rfc2396E" href="mailto:physics0607@physics.wm.edu"><physics0607@physics.wm.edu></a>,
'<a class="moz-txt-link-abbreviated" href="mailto:undergrads0607@physics.wm.edu">undergrads0607@physics.wm.edu</a>'
<a class="moz-txt-link-rfc2396E" href="mailto:undergrads0607@physics.wm.edu"><undergrads0607@physics.wm.edu></a></td>
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<div class="WordSection1">
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">PHYSICS
COLLOQUIUM</span></u></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">Friday, May 1,
2015</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">4:00 PM
</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">Small Hall, Room
110</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Georg Schwiete
</span></b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">[Host: E. Rossi]<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Johannes
Gutenberg Universität Mainz<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Title of Talk:</span></b><o:p></o:p></p>
<p class="MsoNormal"><i><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Nuclear/Particle/Astrophysics
with Slow Neutrons<o:p></o:p></span></i></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Abstract:</span></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">The
influence of disorder on interacting many-body systems plays
a prominent role in modern condensed matter physics. Not
only is the presence of disorder often unavoidable in the
complex materials used in experiment, disorder leads to
fascinating phenomena in their own right. Generally
speaking, disorder tends to slow down the motion of
particles and even very weak disorder may be sufficient to
completely localize them. The addition of interactions to
the problem leads to a plethora of new phenomena. In this
talk, I will discuss selected examples that illustrate the
rich physics of interacting disordered systems at low
temperatures: In experiment, one often observes that
disordered films on the verge of becoming superconducting
develop a pronounced resistance maximum. I will explain our
theoretical understanding of this surprising effect. Next, I
intend to discuss the expansion of a cloud of bosons
subjected to a disorder potential. Despite the obvious
difference between these systems, an efficient theoretical
approach can in both cases be based on the analysis of
effective diffusion equations. This description allows to
clearly identify the physical mechanisms that are relevant
at low temperatures. If time allows, I will also compare
charge and heat transport in the disordered electron liquid
using a similar language.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">*Cookies
& coffee will be served in Room 122 at 3:30 PM</span></i></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">********************</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">CONDENSED
MATTER SEMINAR</span></u></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">Monday, May 4,
2015</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">3:30 PM
</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">Small Hall, Room
122</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Georg Schwiete
</span></b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">[Host: E. Rossi]<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Johannes
Gutenberg Universität Mainz<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Title of Talk:</span></b><o:p></o:p></p>
<p class="MsoNormal"><i><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Transport of
heat in the disordered Fermi and electron liquids<o:p></o:p></span></i></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Abstract:</span></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">The
main subject of this talk is thermal transport in the
disordered Fermi and electron liquids at low temperatures. I
plan to start with a brief introduction to the physics of
quantum corrections to conductivity in disordered systems
and the phenomenology of the metal-insulator transition in
two-dimensional electron systems. Then, I will contrast
approaches to the calculation of electric and thermal
transport. A principle difficulty for the description of
thermal transport is that temperature is an internal
parameter, and a temperature gradient does not correspond to
an external “mechanical” force like a the one originating
from an electric potential. We use Luttinger’s gravitational
potentials as sources for finding the heat density and its
correlation function. For a comprehensive study, we extend
the RG analysis developed for electric transport by
including the gravitational potentials into the RG scheme.
The analysis reveals that for the disordered Fermi liquid
the Wiedemann-Franz law remains valid even in the presence
of quantum corrections caused by the interplay of diffusion
modes and the electron-electron interaction. For the
disordered electron liquid we additionally analyze inelastic
processes induced by the Coulomb interaction at
sub-temperature energies. While the general form of the
correlation function has to be compatible with energy
conservation, these inelastic processes are at the origin of
logarithmic corrections violating the Wiedemann-Franz law.<o:p></o:p></span></p>
<p class="MsoNormal"><b><i><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">References:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">G.
Schwiete and A. M. Finkel’stein, Renormalization group
analysis of thermal transport in the disordered Fermi
liquid, Phys. Rev. B 90, 155441 (2014)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">G.
Schwiete and A. M. Finkel’stein, Thermal transport and the
Wiedemann Franz law in the disordered Fermi liquid, Phys.
Rev. B 90, 060201(R) (2014)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US">G.
Schwiete and A. M. Finkel’stein, Keldysh approach to the
renormalization group analysis of the disordered electron
liquid, Phys. Rev. B 89, 075437 (2014)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><span
style="font-size:10.0pt;font-family:"Times New
Roman","serif";color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Times New
Roman","serif";color:black">******</span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Monotype
Corsiva";color:#1F497D">Eleonor V. Wilkinson</span></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia","serif"">Administrative
& Office Specialist
</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia","serif"">The
College of William & Mary-Physics<br>
Small Hall, Room 123<br>
300 Ukrop Way<br>
Williamsburg, VA 23185</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Times New
Roman","serif";color:black">Telephone:
757-221-3503</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Times New
Roman","serif";color:black">Fax: 757-221-3540</span><o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
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