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

被引：41

作者：

Zaffalon, M. ^{[1
]}

Bid, Aveek ^{[1
]}

Heiblum, M. ^{[1
]}

Mahalu, D. ^{[1
]}

Umansky, V. ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Condensed Matter Phys, Brain Ctr Submicron Res, IL-76100 Rehovot, Israel

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.100.226601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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