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

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

2001-06-26

arxiv.org/abs/cond-mat/0106531v3

Phys. Rev. B 65, 085308 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 7 figures, Revtex, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.085308

We study the Aharonov-Bohm effect in a coupled 2$\times$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).

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