Aharonov-Bohm Effect for Parallel and T-shaped Double Quantum Dots

Details Aharonov-Bohm Effect for Parallel and T-shaped Double Quantum Dots Aharonov-Bohm Effect for Parallel and T-shaped Double Quantum Dots

2005-10-10

arxiv.org/abs/cond-mat/0510253v2

J. Phys. Soc. Jpn. 75, 015004 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 4 figures; minor changes

Scientific paper

10.1143/JPSJ.75.015004

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 4$\pi$ when the two-subring structure is formed via the interdot tunneling $t_c$, we find that the AB oscillation has the period of 2$\pi$ 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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