title: Induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures.
abstract: Search for Majorana fermions renewed interest in semiconductor-superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime. Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor-superconductor ohmic contacts. Supercurrent with characteristic temperature dependence of a ballistic junction has been observed across 0.6 μm, a regime previously achieved only in point contacts but essential to the formation of well separated non-Abelian states. High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.
authors.affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Wan
authors.affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Aleksandr
authors.initials: A
authors.lastname: Kazakov
authors.affiliation: 1] Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA [2] Department of Electrical Engineering, Purdue University, West Lafayette, Indiana 47907, USA [3] Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA [4] Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Manfra
authors.affiliation: Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Loren N
authors.initials: LN
authors.lastname: Pfeiffer
authors.affiliation: Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Ken W
authors.initials: KW
authors.lastname: West
authors.affiliation: 1] Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA [2] Department of Electrical Engineering, Purdue University, West Lafayette, Indiana 47907, USA [3] Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Leonid P
authors.initials: LP
authors.lastname: Rokhinson