Aharonov-Bohm Effect for Parallel and T-shaped Double Quantum Dots
Yoichi Tanaka, Norio Kawakami
Abstract
We investigate the Aharonov-Bohm (AB) effect for the double quantum dots in the Kondo regime using the slave-boson mean-field approximation. In contrast to the non-interacting case, where the AB oscillation generally has the period of 4π when the two-subring structure is formed via the interdot tunneling tc, we find that the AB oscillation has the period of 2π in the Kondo regime. Such effects appear for the double quantum dots close to the T-shaped geometry even in the charge-fluctuation regime. These results follow from the fact that the Kondo resonance is always fixed to the Fermi level irrespective of the detailed structure of the bare dot-levels.
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