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

Abstract

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}.

arXiv comment11 pages, 7 figures

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Cited by in corpus (19)

• Resonant Electron Transport in Single-Molecule Junctions: Vibrational Excitation, Rectification, Negative Differential Resistance and Local Cooling
• Asymmetric Franck-Condon factors in suspended carbon nanotube quantum dots
• Coherent properties of nano-electromechanical systems
• Full counting statistics of a single-molecular quantum dot
• Vibrational effects in charge transport through a molecular double quantum dot
• An electrical probe for mechanical vibrations in suspended carbon nanotubes
• Microwave quantum optics and electron transport through a metallic dot strongly coupled to a transmission line cavity
• Spatiotemporal evolution of polaronic states in finite quantum systems
• Full-counting statistics of energy transport of molecular junctions in the polaronic regime
• Localized polarons and doorway vibrons in finite quantum structures
• Generalized input-output method: A new route to quantum transport junctions
• Phonon distributions of a single bath mode coupled to a quantum dot
• Full counting statistics of phonon-assisted Andreev tunneling through a quantum dot coupled to normal and superconducting leads
• Dynamical symmetry breaking in vibration-assisted transport through nanostructures
• Counting statistics of tunneling through a single molecule: effect of distortion and displacement of vibrational potential surface
• Spectrum and Franck-Condon factors of interacting suspended single-wall carbon nanotubes
• Quantum noise theory for quantum transport through nanostructures
• Robust negative differential conductance and enhanced shot noise in transport through a molecular transistor with vibration assistance
• Interference and shot noise in a degenerate Anderson-Holstein model