Anomalous suppression of the shot noise in a nanoelectromechanical system

Abstract

In this paper we report a relaxation-induced suppression of the noise for a single level quantum dot coupled to an oscillator with incoherent dynamics in the sequential tunneling regime. It is shown that relaxation induces qualitative changes in the transport properties of the dot, depending on the strength of the electron-phonon coupling and on the applied voltage. In particular, critical thresholds in voltage and relaxation are found such that a suppression below 1/2 of the Fano factor is possible. Additionally, the current is either enhanced or suppressed by increasing relaxation, depending on bias being greater or smaller than the above threshold. These results exist for any strength of the electron-phonon coupling and are confirmed by a four states toy model.

7 pages, 7 eps figures, submitted to PRB; minor changes in the introduction

References in corpus (7)

• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Electrical generation and absorption of phonons in carbon nanotubes
• Vibrational sidebands and dissipative tunneling in molecular transistors
• Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
• Current-induced nonequilibrium vibrations in single-molecule devices
• Shot Noise of a Quantum Shuttle
• Full counting statistics of strongly non-Ohmic transport through single molecules

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• Current Noise in Single-Molecule Junctions Induced by Electronic-Vibrational Coupling
• Hierarchical quantum master equation approach to current fluctuations in nonequilibrium charge transport through nanosystems
• Environmental induced renormalization effects in quantum Hall edge states
• Coherent properties of nano-electromechanical systems
• Sub-Poissonian phononic population in a nanoelectromechanical system
• Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot
• Current noise of a superconducting single electron transistor coupled to a resonator
• Non-linear Coulomb blockade microscopy of a correlated one-dimensional quantum dot
• Interference and shot noise in a degenerate Anderson-Holstein model