Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-05-23
Nano Letters vol.8, No.12, 4098-4102 (2008) (Cover paper)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 5 figures
Scientific paper
10.1021/nl801454k
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 energy, 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 energy, we observe universal conductance fluctuations whose amplitude is enhanced due to Andreev reflection at the contacts.
Bakkers Erik P. A. M.
Doh Yong-Joo
Franceschi Silvano de
Kouwenhoven Leo P.
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