Multi-terminal Josephson junctions as topological matter

Par Manuel Houzet, INAC/PHELIQS, CEA et Université Grenoble, Alpes

Mardi 21 Février, 14h, Salle des séminaires (215), 2ème étage, Bâtiment A4N

Abstract :

We show that n-terminal Josephson junctions with conventional superconductors may provide a straightforward realization of tunable topological materials in n−1 dimensions, the independent superconducting phases playing the role of quasi-momenta. In particular, we find zero-energy Weyl points in the Andreev bound state spectrum of 3 and 4-terminal junctions. The topological properties of the junction may be probed experimentally by measuring the transconductance between two voltage-biased leads, which we predict to be quantized