Abstract
Based on calculations of the electronic structure of serially coupled triplequantum dots (left, middle, right dots) (STQDs), we study the transportproperties of the system driven by an ac electric field. It is found that theΛ-type energy level of STQDs has great impact on the transport properties. For anasymmetric (between left and right dots) configuration, there is a symmetric peak in thecurrent-AC frequency curve due to resonant photon induced mixing between the left/rightdot and the middle dot. In the symmetric (between left and right dots) configuration, aFano asymmetric line shape appears in the current-frequency curve with the help of a‘trapping dark state’. Here the interesting coherent trapping phenomena, which usualappear in quantum optics, play an essential role in quantum electronic transport. Weprovide a clear physics picture for the Fano resonance and convenient ways to tune theFano effects.
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