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We study the Aharonov-Bohm effect in a coupled 2$\times$2 quantum dot arraywith two-terminals. A striking conductance dip arising from the Fanointerference is found as the energy levels of the intermediate dots aremismatched, which is lifted in the presence of a magnetic flux. A novel fivepeak structure is observed in the conductance for large mismatch. TheAharonov-Bohm evolution of the linear conductance strongly depends on theconfiguration of dot levels and interdot and dot-lead coupling strengths. Inaddition, the magnetic flux and asymmetry between dot-lead couplings can inducethe splitting and combination of the conductance peak(s).Comment: 15 pages, 7 figures, Revtex, to be published in Phys. Rev.

Fano resonances and Aharonov-Bohm effects in transport through a square quantum dot molecule