title: Strong Superconducting Proximity Effects in PbS Semiconductor Nanowires.
abstract: We report the fabrication of strongly coupled nanohybrid superconducting junctions using PbS semiconductor nanowires and Pb0.5In0.5superconducting electrodes. The maximum supercurrent in the junction reaches up to ∼15 μA at 0.3 K, which is the highest value ever observed in semiconductor-nanowire-based superconducting junctions. The observation of microwave-induced constant voltage steps confirms the existence of genuine Josephson coupling through the nanowire. Monotonic suppression of the critical current under an external magnetic field is also in good agreement with the narrow junction model. The temperature-dependent stochastic distribution of the switching current exhibits a crossover from phase diffusion to a thermal activation process as the temperature decreases. These strongly coupled nanohybrid superconducting junctions would be advantageous to the development of gate-tunable superconducting quantum information devices.
authors.affiliation: Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea.
authors.forename: Bum-Kyu
authors.initials: BK
authors.lastname: Kim
authors.affiliation: Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea.
authors.forename: Hong-Seok
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Department of Physics, University of California , Davis, California 95616, United States.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Physics, University of California , Davis, California 95616, United States.
authors.forename: Xingyue
authors.initials: X
authors.lastname: Peng
authors.affiliation: Department of Physics, University of California , Davis, California 95616, United States.
authors.forename: Dong
authors.identifier: 0000-0002-8386-065X
authors.initials: D
authors.lastname: Yu
authors.affiliation: Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea.
authors.forename: Yong-Joo
authors.identifier: 0000-0001-8203-5263
authors.initials: YJ
authors.lastname: Doh
keywords: Josephson junction; PbS semiconductor nanowire; superconducting proximity effects; supercurrent; switching current distribution