We study the Aharonov-Bohm effect in a coupled 2×2 quantum dot array with two-terminals. A striking conductance dip arising from the Fano interference is found as the energy levels of the intermediate dots are mismatched, which is lifted in the presence of a magnetic flux. A novel five peak structure is observed in the conductance for large mismatch. The Aharonov-Bohm evolution of the linear conductance strongly depends on the configuration of dot levels and interdot and dot-lead coupling strengths. In addition, the magnetic flux and asymmetry between dot-lead couplings can induce the splitting and combination of the conductance peak(s).
Cite
@article{arxiv.cond-mat/0106531,
title = {Fano resonances and Aharonov-Bohm effects in transport through a square quantum dot molecule},
author = {Z. Y. Zeng and F. Claro and Alejandro Pérez},
journal= {arXiv preprint arXiv:cond-mat/0106531},
year = {2009}
}
Comments
15 pages, 7 figures, Revtex, to be published in Phys. Rev. B