Andreev Reflection versus Coulomb Blockade in Hybrid Semiconductor Nanowire Devices (Articolo in rivista)

Type
Label
  • Andreev Reflection versus Coulomb Blockade in Hybrid Semiconductor Nanowire Devices (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Doh, YJ; De Franceschi, S; Bakkers, EPAM; Komenhoven, LP (2008)
    Andreev Reflection versus Coulomb Blockade in Hybrid Semiconductor Nanowire Devices
    in Nano letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Doh, YJ; De Franceschi, S; Bakkers, EPAM; Komenhoven, LP (literal)
Pagina inizio
  • 4098 (literal)
Pagina fine
  • 4102 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 8 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[De Franceschi, Silvano] CEA, INAC SPMS LaTEQS, F-38054 Grenoble, France; [Doh, Yong-Joo; Komenhoven, Leo P.] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands; [De Franceschi, Silvano] CNR, INFM, Lab Nazl TASC, I-34012 Trieste, Italy; [Bakkers, Erik P. A. M.] Philips Res Labs, NL-5656 AA Eindhoven, Netherlands (literal)
Titolo
  • Andreev Reflection versus Coulomb Blockade in Hybrid Semiconductor Nanowire Devices (literal)
Abstract
  • Semiconductor nanowires provide promising low-dimensional systems for the study of quantum transport phenomena in combination with superconductivity. Here we investigate the competition between the Coulomb blockade effect, Andreev reflection, and quantum interference, in InAs and InP nanowires connected to aluminum-based superconducting electrodes. We compare three limiting cases depending on the tunnel coupling strength and the characteristic Coulomb interaction energy. For weak coupling and large charging energies, negative differential conductance is observed as a direct consequence of the BCS density of states in the leads. For intermediate coupling and charging energy smaller than the superconducting gap, the current-voltage characteristic is dominated by Andreev reflection and Coulomb blockade produces an effect only near zero bias. For almost ideal contact transparencies and negligible charging energies, we observe universal conductance fluctuations whose amplitude is enhanced because of Andreev reflection at the contacts. (literal)
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