The Enhanced Sensitivity of the Transmission Phase of a Quantum Dot to Kondo Correlations

Details The Enhanced Sensitivity of the Transmission Phase of a Quantum Dot to Kondo Correlations The Enhanced Sensitivity of the Transmission Phase of a Quantum Dot to Kondo Correlations

2001-12-17

arxiv.org/abs/cond-mat/0112308v3

Phys. Rev. Lett. 90, 106602 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.90.106602

The strong sensitivity of the transmission phase through a quantum dot embedded into one arm of a two-wave Aharonov-Bohm interferometer to the Kondo effect is explained. The enhancement takes place because of the buildup of the exchange scattering on the dot due to Kondo correlations even much above $T_{K}$. The enhanced exchange competes with the potential scattering, which is always weak. Both cases of the Anderson impurity model and a multilevel quantum dot are considered. In the latter case in addition to the description of peculiar phase behavior a mechanism leading to ferromagnetic Kondo coupling in quantum dots is proposed.

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