Mesoscopic conductance fluctuations in a coupled quantum dot system

Details Mesoscopic conductance fluctuations in a coupled quantum dot system Mesoscopic conductance fluctuations in a coupled quantum dot system

2005-12-09

arxiv.org/abs/cond-mat/0512191v2

Phys. Rev. B 74, 041311(R) (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; revised for publication

Scientific paper

10.1103/PhysRevB.74.041311

We study the transport properties of an Aharonov-Bohm ring containing two quantum dots. One of the dots has well-separated resonant levels, while the other is chaotic and is treated by random matrix theory. We find that the conductance through the ring is significantly affected by mesoscopic fluctuations. The Breit-Wigner resonant peak is changed to an antiresonance by increasing the ratio of the level broadening to the mean level spacing of the random dot. The asymmetric Fano form turns into a symmetric one and the resonant peak can be controlled by magnetic flux. The conductance distribution function clearly shows the influence of strong fluctuations.

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