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<td>Please Save The Date: Special Physics & Applied
Science Colloquium Friday, July 31, 2015 "Optical
Spectroscopy on Superconducting Films" - Dr. Martin
Dressel</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Wed, 24 Jun 2015 20:07:13 +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></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">CC: </th>
<td>'<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 &
APPLIED SCIENCE 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, July 31,
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
111</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">Dr. Martin
Dressel
</span></b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">[Hosts: M.
Qazilbash & G. Luepke]<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">1. Physikalisches
Institut, Universität Stuttgart, Germany<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></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">Optical
Spectroscopy on Superconducting Films<o:p></o:p></span></i></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Times New
Roman","serif";color:black">Abstract:<o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">The
electrodynamic properties of superconductors are of interest
from a fundamental side as well as for applications. Since
the seminal work of M. Tinkham on the superconducting energy
gap in the late 1950s optical investigations have been
established as a powerful method to explore the
quasi-particle excitations and their dynamics which yield
important information on the density of states, the symmetry
of the order parameter, the scattering mechanism, and
eventually the glue to super¬conductivity. In addition, the
superconducting condensate is probed, i.e. the Cooper pair
density and stiffness. Most recently, it became clear that
under certain conditions, also collective modes can be
studied: these are the phason excitations (Nambu-Goldstone
mode) and the amplitude mode (Higgs mode).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">The talk will
give a general introduction to the optical properties of
superconductors, sketch the theory and highlight some
important experimental findings, as well as applications,
such as superconducting single photon detectors. In
particular we will focus on ultrathin superconducting films,
such as InO, Nb, NbN, TiN, and TaN, but also Al, which
exhibit a superconductor-insulator transition as disorder or
granularity increases. We discuss the possibility of
collective low-frequency ex¬citations due to the Higgs
mechanism, which become long-lived and well defined in the
vicinity of a quantum critical point.<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">References
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">[1] M. Dressel et
al., IEEE Sel. Top. Quant. Electr. 14, 399 (2008); Adv.
Condens. Matter Phys. 2013, 104379 (2013).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">[2] U. S. Pracht
et al., IEEE Trans. THz Sci. Technol. 3, 269 (2013); Phys.
Rev. B 86, 184503 (2012).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">[3] D. Sherman et
al., Phys. Rev. B 89, 035149 (2014); Nature Phys. 11, 188
(2015).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black">[4] N. Bachar et
al., J. Low Temp. Phys. 179, 83 (2014).<b><i><o:p></o:p></i></b></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"><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">*Refreshments
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"> </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"><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"><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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