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<p class="MsoNormal"><a name="_Hlk152055189"><b><span lang="EN-US" style="font-size:24.0pt;line-height:105%;color:black">SmallTalk
</span></b></a><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US" style="font-size:14.0pt;line-height:105%;color:black">[about Nanoscience]</span></b></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US" style="color:black">On Monday </span></b></span><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US">April 29th
</span></b></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">at 15.00h</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US">
<span style="color:black">we welcome you all to our SmallTalk seminar series. You are welcome to join us in lecture hall <b>Kollektorn, MC2 with fika</b> or on zoom.<o:p></o:p></span></span></span></p>
<h1><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black;font-weight:normal">Our speaker is
</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black">Anastasiia Ciers</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black;font-weight:normal">,
Postdoc, Quantum Technology, Microtechnology and Nanoscience. The seminar is titled "Exploring aluminium nitride for optomechanics".
</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;font-weight:normal"><o:p></o:p></span></span></h1>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Abstract:<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">To isolate its motion from disturbance from the environment, a resonator must have an ultrahigh mechanical quality factor, Q, and high mechanical frequency,
f. By taking advantage of strain engineering, quality factors up to 10 billion can be reached in crystalline silicon resonators. Crystalline materials provide lower density of defects, enabling higher mechanical quality factors and new functionality compared
to amourphous materials. A wide bandgap aluminium nitride grown on silicon has a high lattice mismatch providing a high quality mechanical factor and relatively high piezoelectricity coefficient. We demonstrate resonator designs with ultrahigh mechanical quality
factors and reach Qf products above 1012. These are the first ultrahigh-Q resonators that feature piezoelectricity and we expect that they can be used in quantum optomechanical systems.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">The seminar is divided into two parts, where the first part consists of a pure overview of the field and is held on a generally accessible level (10<span class="apple-converted-space"> </span>min).
The second part will be more technical (15-20 minutes).<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Looking forward to seeing you live or on Zoom:
</span></span><a href="https://chalmers.zoom.us/j/61929604403"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US">https://chalmers.zoom.us/j/61929604403</span></span><span style="mso-bookmark:_Hlk152055189"></span></a><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Best regards, <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Angela, Nils, Christoph, and Janine</span></span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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