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Published on: March 20, 2017
Transmission phase in the Kondo regime revealed in a two-path interferometer
S Takada1, C Bäuerle2, M Yamamoto3
1Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Abstract:
We report on the direct observation of the transmission phase shift through a Kondo correlated quantum dot by employing a new type of two-path interferometer. We observed a clear π/2-phase shift, which persists up to the Kondo temperature TK. Above this temperature, the phase shifts by more than π/2 at each Coulomb peak, approaching the behavior observed for the standard Coulomb blockade regime. These observations are in remarkable agreement with two-level numerical renormalization group calculations. The unique combination of experimental and theoretical results presented here fully elucidates the phase evolution in the Kondo regime.
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