Topological properties of Andreev states in superconductor-semiconductor hybrid junctions

Dr Manuel Houzet

CEA–IRIG Grenoble (France)

Manuel Houzet is a physicist in condensed matter theory. He received his PhD on the coexistence of superconductivity and magnetism from Bordeaux University in 2001. Since 2002 he has been working at CEA Grenoble in PHELIQS laboratory. He was also a visiting researcher at University of Minnesota in 2003-2004 and Yale University in 2017-2018. His current interests are in the fields of mesoscopic superconductivity and topological phases of matter. He is the author or co-author of 75 articles. 


I will first review the process of Andreev reflection, which allows inducing superconducting correlations from a superconductor to a normal metal or a semiconductor. In particular, I will detail the conditions for that process to be efficient. I will then relate the Josephson effect to the formation of Andreev states that are confined between the superconducting terminals. Finally, I will present our recent predictions on the topological properties carried by the Andreev states in multiterminal Josephson junctions. I will show that they can be detected through a quantized transverse conductance between two voltage-biased leads.