Even-odd effect in Andreev transport through a carbon nanotube quantum dot.

Even-odd effect in Andreev transport through a carbon nanotube quantum dot. Research Abstract Details 

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Even-odd effect in Andreev transport through a carbon nanotube quantum dot. Abstract Text:

A Eichler,M Weiss,S Oberholzer,C ,A Levy Yeyati,J C Cuevas,A ,A Eichler,M Weiss,S Oberholzer,C ,A Levy Yeyati,J C Cuevas,A ,

We have measured the current (I)-voltage (V) characteristics of a single-wall carbon nanotube quantum dot coupled to superconducting source and drain contacts in the intermediate coupling regime. Whereas the enhanced differential conductance dI/dV due to the Kondo resonance is observed in the normal state, this feature around zero-bias voltage is absent in the superconducting state. Nonetheless, a pronounced even-odd effect appears at finite bias in the dI/dV subgap structure caused by Andreev reflection. The first-order Andreev peak appearing around V=Delta/e is markedly enhanced in gate-voltage regions, in which the charge state of the quantum dot is odd. This enhancement is explained by a "hidden" Kondo resonance, pinned to one contact only. A comparison with a single-impurity Anderson model, which is solved numerically in a slave-boson mean-field approach, yields good agreement with the experiment.

Even-odd effect in Andreev transport through a carbon nanotube quantum dot. Publishing Authors By Initials

A Eichler,M Weiss,S Oberholzer,C ,A Levy Yeyati,JC Cuevas,A ,A Eichler,M Weiss,S Oberholzer,C ,A Levy Yeyati,JC Cuevas,A ,

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Even-odd effect in Andreev transport through a carbon nanotube quantum dot. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Physical review letters

VOLUME: 99

Page Numbers: 126602

Journal Abbreviation: Phys. Rev. Lett.

ISSN: 0031-9007

DAY: 19

MONTH: 09

YEAR: 2007

Even-odd effect in Andreev transport through a carbon nanotube quantum dot. Information

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LANGUAGE: eng

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AFFILIATION: Institut für Physik, Universität Basel, Klingelbergstr. 82, CH-4056 Basel, Switzerland.

Country: United States

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MEDLINETA: Phys Rev Lett

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