title: Quantum Hall effect in graphene with superconducting electrodes.
abstract: We have realized an integer quantum Hall system with superconducting contacts by connecting graphene to niobium electrodes. Below their upper critical field of 4 T, an integer quantum Hall effect coexists with superconductivity in the leads but with a plateau conductance that is larger than in the normal state. We ascribe this enhanced quantum Hall plateau conductance to Andreev processes at the graphene-superconductor interface leading to the formation of so-called Andreev edge-states. The enhancement depends strongly on the filling-factor and is less pronounced on the first plateau due to the special nature of the zero energy Landau level in monolayer graphene.
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
authors.forename: Peter
authors.initials: P
authors.lastname: Rickhaus
authors.forename: Markus
authors.initials: M
authors.lastname: Weiss
authors.forename: Laurent
authors.initials: L
authors.lastname: Marot
authors.forename: Christian
authors.initials: C
authors.lastname: Schönenberger