The Time Reversal Invariant Fractional Josephson Effect
Topological Superconductivity is a topic of current interest because of its potential for providing a new method for storing and manipulating quantum information. One of the most basic consequences of topological superconductivity is the fractional Josephson effect, which arises due to the coherent tunneling of single electrons between two superconductors and gives rise to an AC Josephson effect with half the usual Josephson frequency. In this talk we will review the theoretical foundations for the fractional Josephson effect and discuss prospects for observing it in proximity effect structures based on semiconductor nanowires as well as on topological insulators. We will then describe recent work in which we have shown that the presence of time reversal symmetry leads to a significant modification of the fractional Josephson effect.
Host: Victor Galitski