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<p class="MsoPlainText"><b>Mark Fischer, ETH Zurich, Friday, May 24, 2019</b><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Room 1080 Smith Seminar Room - Physics Research Building<span style="color:#1F497D"><o:p></o:p></span></span></p>
<p class="MsoPlainText">11AM – 12 (Noon)<o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Host: Nandini Trivedi<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">“Superconductivity without inversion and time-reversal symmetries”</span></b><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Traditionally, in three dimensions, the only symmetries essential for superconductivity are time-reversal symmetry (TRS) and inversion. In my talk, I will discuss the situation
of superconductivity in two dimensions and how TRS and inversion are not required, and having a combination of either symmetry with a mirror operation on the basal plane is sufficient. By combining energetic and topological arguments, superconducting states
can be classified when TRS and inversion are not present, a situation encountered in several experimentally relevant systems, such as transition metal dichalcogenides or a two-dimensional Rashba system, when subject to an applied field, and in superconducting
monolayer FeSe with Neel antiferromagnetic order. Energetic arguments suggest interesting superconducting states can arise, such as a unique pure intraband pairing state with Majorana chiral edge states in Neel-ordered FeSe. Employing topological arguments
I will show how with only inversion combined with mirror symmetry present, the superconducting states are generically fully gapped and can have topologically protected chiral Majorana edge modes. In all other cases, there are no chiral Majorana edge states,
but the superconducting bulk can have point nodes with associated topologically protected flat-band Majorana edge modes. This analysis thus provides guidance on the design and search for novel two-dimensional superconductors and superconducting heterostructures.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333"><br>
</span><b><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#BB0000;background:white">Erin Bauder</span></b><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333">,
<span style="background:white">Fiscal Associate </span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#BB0000;background:white">Department of Physics</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333"><br>
2120 Physics Research Building | 191 West Woodruff Avenue Columbus, OH 43210<br>
614-292-3437 Office <br>
</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#1F497D;background:white"><a href="mailto:bauder.6@osu.edu">bauder.6@osu.edu</a></span><o:p></o:p></p>
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