laboratoire pierre aigrain
électronique et photonique quantiques
laboratoire pierre aigrain

Seminar, November 9th 2015

Manuel Houzet (CEA Grenoble INAC/SPSMS)
Anomalous Josephson effect as a probe of topological superconductivity

We study a Josephson junction formed by connecting two superconductors through the helical edge states of a quantum spin-Hall insulator or through a semiconducting nanowire with Rashba spin-orbit coupling. In the presence of a suitably oriented magnetic field, such system displays the anomalous Josephson effect : a nonzero supercurrent in the absence of a superconducting phase difference between the leads. We show that this anomalous current can be increased significantly by tuning the superconducting parts of the junction into the topologically nontrivial phase, in which they host Majorana bound states.