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 Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot


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Motivated by a recent experiment on nonlinear tunneling in a suspended Carbon nanotube connected to two normal electrodes S. Sapmaz, {\it et al}., Phys. Rev. Lett. {\bf 96}, 26801 2006, we investigate nonequilibrium vibration-mediated sequential tunneling through a molecular quantum dot with two electronic orbitals asymmetrically coupled to two electrodes and strongly interacting with an internal vibrational mode, which is itself weakly coupled to a dissipative phonon bath. For this purpose, we establish rate equations using a generic quantum Langevin equation approach. Based on these equations, we study in detail the current-voltage characteristics and zero-frequency shot noise, paying special attention to the advanced or postponed of the appearance of negative differential conductance and super-Poissonian current noise resulting from electron-phonon-coupling induced {\em selective unidirectional cascades of single-electron transitions}.



Author: X. Y. Shen; Bing Dong; X. L. Lei; N. J. M. Horing

Source: https://archive.org/







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