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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Please join us TODAY for the CME Seminar presented by Nuh Gedik from the Massachusetts Institute of Technology (MIT) at 11:30am in the Smith Seminar Room (1080 PRB).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Georgia","serif"">“Ultrafast Probing of Dirac Fermions in Topological Insulators”<o:p></o:p></span></b></p>
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<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">The three-dimensional topological insulator (TI) is a new phase of matter that exhibits quantum-Hall-like properties, even in the absence of an external magnetic field. In this
talk, I will discuss recent experiments in which we used ultrafast laser pulses to directly visualize spin texture of topological surface electrons and their coupling to the bulk electrons. We find that an idealized helical spin texture only exists within
a small energy window about the Dirac point. Our time resolved measurements indicate that coupling between surface and bulk electrons are mediated by phonons. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Trisch<o:p></o:p></span></p>
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<p class="MsoNormal"><img width="224" height="45" id="Picture_x0020_1" src="cid:image001.png@01CE471A.23CE2F80" alt="The Ohio State University"><br>
<b><span style="color:#C00000">Trisch Longbrake</span></b><o:p></o:p></p>
<p class="MsoNormal">Administrative Associate I<br>
<span style="color:#C00000">Department of Physics</span> Condensed Matter<br>
2196 Physics Research Building, 191 W. Woodruff Ave., Columbus, OH 43210<br>
614-292-2778 Office / 614-292-7557 Fax<br>
<a href="mailto:longbrake.6@osu.edu">longbrake.6@osu.edu</a> <a href="http://osu.edu/">
osu.edu</a><o:p></o:p></p>
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