Reference : Charge pumping in strongly-coupled molecular quantum dots
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Charge pumping in strongly-coupled molecular quantum dots
Haughian, Patrick mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Yap, Han Hoe mailto [National University of Singapore > Department of Physics]
Gong, Jiangbin mailto [National University of Singapore > Department of Physics]
Physical Review. B
[en] Nanomechanics ; Mesoscopic physics ; Quantum transport
[en] The interaction between electrons and the vibrational degrees of freedom of a molecular quantum dot can lead to an exponential suppression of the conductance, an effect which is commonly termed Franck-Condon blockade. Here, we investigate this effect in a quantum dot driven by time-periodic gate voltages and tunneling amplitudes using nonequilibrium Green's functions and a Floquet expansion. Building on previous results showing that driving can lift the Franck-Condon blockade, we investigate driving protocols which can be used to pump charge across the quantum dot. In particular, we show that due to the strongly coupled nature of the system, the pump current at resonance is an exponential function of the drive strength.
Fonds National de la Recherche - FnR
FnR ; FNR7556175 > Thomas Schmidt > MoMeSys > Modern Mesoscopic Systems And Applications In Nanoelectronics And Spintronics > 01/02/2015 > 31/01/2020 > 2014

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