Condensed-Matter Physics & Materials Science Seminar

"Band edge and photo induced superconductivity"

Presented by Garry Goldstein, Rutgers

Thursday, June 4, 2015, 1:30 pm — 2nd Fl Lecture Room ISB

We discuss novel routes to obtain superconductivity in semiconductors. We consider a semiconductor with a band dispersion where there is a band edge, such as semiconductors with Rashba spin-orbit coupling or bilayer graphene with a voltage between the layers. We find robust superconductivity, both p-wave and s-wave depending on the type of band edge, for semiconductors with attractive interactions (such as those caused by phonon exchange) when we tune the chemical potential close to the band edge. We also consider photo induced superconductivity in a two band semiconductor. We use optical pumping to induce nonequilibrium populations within the bands. We find robust superconductivity for appropriate chemical potential and dispersion relations for the bands. This s-wave superconductivity can be induced by both repulsive and attractive interactions depending on the exact band dispersions. Various band geometries are discussed.

Hosted by: Robert Konik

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