<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="font-family: "Times New Roman", serif; font-size: 12pt;"> </span><br>
</div>
<div id="signature">
<div>
<div class="WordSection1">
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<span style="font-size:10.5pt; font-family:"Arial","sans-serif"; color:#1F497D">***** Seminar *****</span><span style="color:#1F497D"></span></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:16.0pt; color:#1F497D">Department of Electrical and Computer Engineering</span></b><span style="font-size:16.0pt; color:#1F497D"></span></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:16.0pt; color:#1F497D">Materials Engineering Program</span></b></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:14.0pt; color:#1F497D">Center for Integrated Bio and Nano Systems</span></b></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:14.0pt; color:#1F497D"> Feb. 15, 2019</span></b><span style="font-size:14.0pt; color:#1F497D"></span></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:14.0pt; color:#1F497D">10:30 a.m., Room: CBB 108 </span>
</b><span style="font-size:14.0pt; color:#1F497D"></span></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<b><span style="font-size:18.0pt; color:#1F497D">Identifying Topological Materials for Quantum Computing Applications with Advanced Electron Microscopy </span></b></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<span style="font-size:18.0pt"> <span style="color:#1F497D">David C. Bell</span></span></p>
<p class="MsoNormal" align="center" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:center">
<span style="font-size:16.0pt; color:#1F497D">Harvard University</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<b><span style="color:#1F497D">Abstract</span></b><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">:</span><span style="color:#1F497D"> Depending on the composition, Quantum Materials may act as conductors, insulators, semiconductors
or even as superconductors. Combinations of different quantum materials are of high interest to explore new phenomena and act as the foundation for future electronic devices at the nanometer scale. Our quantum materials research reaches from defect formation
in graphene to the characterization of hybrid quantum materials. I will present our work utilizing Low-Voltage Monochromated EELS and Low-Voltage High-Resolution Electron Microscopy (LV HREM). Together, these often improve the contrast to damage ratio obtained
on a large class of samples. The exploration and synthesis constitute only one aspect of the challenges in the development of new topological materials, another challenge is their characterization. Since the phenomena appear at very restricted and dedicated
conditions, the characterization method must have very high sensitivity, resolution, localization and precision.
</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="color:#1F497D">Transmission electron microscopy is a powerful technique to investigate structural, compositional or electromagnetic properties of topological materials. Especially, recent implementation of aberration correction in the transmission
electron microscopy made chemical and structural characterization with very high spatial resolution (in the range of picometers) and sensitivity possible. This in turn allows detailed analysis of superconductor and topological materials, where small compositional
variations have large effects on the material properties. </span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="color:#1F497D">For topological materials 2005 was an important milestone as a consequence the realization of the existence of a metallically conductive surface state in an insulator material. Within couples of years, the experimental evidences
of the surface state followed the theory studies. A high spin orbit coupling creates edge states where quantum spin Hall Effect can exist in the absence of an external magnetic field. The discovery of the new phenomenon opened up intensive discussions in condensed
matter, and even very well-known conventional material systems such as Bi2(Te,Se)3, BiSb alloys etc., became “exotic” and highly investigated materials again.
</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="color:#1F497D">One idea is using the kagome lattice as a topological switch. The kagome lattice is a two-dimensional network of corner-sharing triangles known as a platform for exotic quantum magnetic states. Theoretical work has predicted that
the kagome lattice may also host Dirac electronic states that could lead to topological and insulating phases, but these have evaded experimental detection to date. Fe3Sn2 is a rare metallic Kagome ferromagnet, which synthesis as a single crystal has not previously
been reported. We study this single crystal as well as other topological insulators with the particular interest in the correlated behavior in topologically non-trivial materials. </span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<b><span style="color:#1F497D">Bio</span></b><span style="color:#1F497D">: Gordon McKay Professor of Applied Physics, Professor of the Practice in Electron Microscopy, Harvard University
</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">EDUCATION</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Post. Doc. Materials Science & Physics, NSF Postdoctoral Associate, Massachusetts Institute of Technology 1997-1999</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Ph.D. Physics, University of Melbourne, Australia, 1997</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">B.Sc. (Hons). Honors in Physics, University of Melbourne, Australia, 1991</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">B.Sc. (Physics, Genetics, Mathematics), University of Melbourne, Australia, 1990</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:justify; text-autospace:none">
<span style="color:#1F497D">If you no longer wish to receive the announcements from the IBNS News Listserver, please email "SIGNOFF IBNSNEWS" in the body of the message (leave subject line empty) to <<a href="mailto:listserv@listserv.uh.edu">listserv@listserv.uh.edu</a>>.
The email needs to originate from the email address, which the Listserver sends the announcements to. You can also send an email to <<a href="mailto:nanomag@uh.edu">nanomag@uh.edu</a>> with the request to subscribe to or unsubscribe from the list.
</span></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;text-align:justify">
<span style="color:#1F497D"> </span></p>
<div>
<div>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
</div>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
</p>
</div>
</div>
</div>
</div>
</body>
</html>