Transmission phase of a singly occupied quantum dot in the Kondo regime |
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Authors: | Zaffalon M Bid Aveek Heiblum M Mahalu D Umansky V |
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Affiliation: | Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, Israel. |
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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. |
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