Symmetry-pro tected topological phases have gapless surface (edge) states. These states are robust against any single-body perturbation that has the symmetry\, a s long as the gap in the bulk spectrum is not closed. Recently\, it is fou nd that these gapless surface states can be gapped when many-body interact ion is included. In this talk\, I will discuss what kind of many-body inte raction opens a gap in the surface of topological superconductor without b reaking its symmetry.

\n\nTime reversal symmetric topological superc onductor carries gapless Majorana fermion on the surface. I will discuss t he &ldquo\;Coupled Wire Model&rdquo\; which we built to mimic the massless Majoranas in the surface. I will talk about how the explicit many-body in ter-wire interaction\, that we introduced\, preserves time reversal symmet ry but opens a gap in the surface spectrum. I will also discuss the result ing gapped surface carrying non-trivial topological order evident from the anyon structure that we find. \;

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\n DTSTART:20160425T194500Z LOCATION:Physics Building\, Room 204 SUMMARY:Symmetric surfaces of three dimensional topological superconductor END:VEVENT END:VCALENDAR