Fano Regime of Transport through Open Quantum Dots

Abstract

We analyze a quantum dot strongly coupled to the conducting leads via quantum point contacts - Fano regime of transport - and report a variety of resonant states which demonstrate the dominance of the interacting resonances in the scattering process in a low confining potential. There are resonant states similar to the eigenstates of the isolated dot, whose widths increase with increasing the coupling strength to the environment, and hybrid resonant states. The last ones are approximatively obtained as a linear combination of eigenstates with the same parity in the lateral direction, and the corresponding resonances show the phenomena of resonance trapping or level repulsion. The existence of the hybrid modes suggests that the open quantum dot behaves in the Fano regime like an artificial molecule.

REVTeX4, 23 pages, 12 figures. Changed the title; Changed the abrupt potential with linearly varying potential at the dot-lead interfaces; Changed all figures; Added new figures; Concise presentation of the analytical calculations; Corrected typos; Added references

References in corpus (10)

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Cited by in corpus (6)

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• Conductance oscillations of core-shell nanowires in transversal magnetic fields
• Magnetic field-induced control of transport in multiterminal focusing quantum billiards
• Current control by resonance decoupling and magnetic focusing in soft-wall billiards
• A T-shaped double quantum dot system as a Fano interferometer: interplay of coherence and correlation upon spin currents