Transmission phase of a singly occupied quantum dot in the Kondo regime

We report on the phase measurements on a quantum dot containing a single electron in the Kondo regime. Transport takes place through a single orbital state. Although the conductance is far from the unitary limit, we measure directly, for the first time, a transmission phase as theoretically predicte...

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Published inPhysical review letters Vol. 100; no. 22; p. 226601
Main Authors Zaffalon, M, Bid, Aveek, Heiblum, M, Mahalu, D, Umansky, V
Format Journal Article
LanguageEnglish
Published United States 06.06.2008
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Abstract We report on the phase measurements on a quantum dot containing a single electron in the Kondo regime. Transport takes place through a single orbital state. Although the conductance is far from the unitary limit, we measure directly, for the first time, a transmission phase as theoretically predicted of pi/2. As the dot's coupling to the leads is decreased, with the dot entering the Coulomb blockade regime, the phase reaches a value of pi. Temperature shows little effect on the phase behavior in the range 30-600 mK, even though both the two-terminal conductance and amplitude of the Aharonov-Bohm oscillations are strongly affected. These results also suggest that previous phase measurements involved transport through more than a single level.
AbstractList We report on the phase measurements on a quantum dot containing a single electron in the Kondo regime. Transport takes place through a single orbital state. Although the conductance is far from the unitary limit, we measure directly, for the first time, a transmission phase as theoretically predicted of pi/2. As the dot's coupling to the leads is decreased, with the dot entering the Coulomb blockade regime, the phase reaches a value of pi. Temperature shows little effect on the phase behavior in the range 30-600 mK, even though both the two-terminal conductance and amplitude of the Aharonov-Bohm oscillations are strongly affected. These results also suggest that previous phase measurements involved transport through more than a single level.
Author Umansky, V
Bid, Aveek
Zaffalon, M
Mahalu, D
Heiblum, M
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/18643437$$D View this record in MEDLINE/PubMed
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Snippet We report on the phase measurements on a quantum dot containing a single electron in the Kondo regime. Transport takes place through a single orbital state....
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Title Transmission phase of a singly occupied quantum dot in the Kondo regime
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