Super-poissonian noise, negative differential conductance, and relaxation effects in transport through molecules, quantum dots and nanotubes

Abstract

We consider charge transport through a nanoscopic object, e.g. single molecules, short nanotubes, or quantum dots, that is weakly coupled to metallic electrodes. We account for several levels of the molecule/quantum dot with level-dependent coupling strengths, and allow for relaxation of the excited states. The current-voltage characteristics as well as the current noise are calculated within first-order perturbation expansion in the coupling strengths. For the case of asymmetric coupling to the leads we predict negative-differential-conductance accompanied with super-poissonian noise. Both effects are destroyed by fast relaxation processes. The non-monotonic behavior of the shot noise as a function of bias and relaxation rate reflects the details of the electronic structure and level-dependent coupling strengths.

arXiv comment8 pages, 7 figures, submitted to Phys. Rev. B, added references

References in corpus (22)

• Shot Noise in Mesoscopic Conductors
• Kondo Physics in a Single Electron Transistor
• Kondo physics in carbon nanotubes
• Phonon effects in molecular transistors: Quantum and classical treatment
• Resonant tunneling through ultrasmall quantum dots: zero-bias anomalies, magnetic field dependence, and boson-assisted transport
• A Quantum Dot in the Kondo Regime Coupled to Superconductors
• Electron-hole symmetry in a semiconducting carbon nanotube quantum dot
• Zero-bias anomalies and boson-assisted tunneling through quantum dots
• Positive cross-correlations in a three-terminal quantum dot with ferromagnetic contacts
• Influence of nano-mechanical properties on single electron tunneling: A vibrating Single-Electron Transistor
• Zero Frequency Current Noise for the Double Tunnel Junction Coulomb Blockade
• Noise of a Quantum-Dot System in the Cotunneling Regime
• Low-temperature Conductance Measurements On Single Molecules
• Current and power spectrum in a magnetic tunnel device with an atomic size spacer
• Current collapse in tunneling transport through benzene
• Enhanced shot noise in resonant tunnelling via interacting localised states
• Positive cross-correlations due to Dynamical Channel-Blockade in a three-terminal quantum dot
• Shot noise in tunneling transport through molecules and quantum dots
• Shot noise of coupled semiconductor quantum dots
• Dynamical Spin-Blockade in a quantum dot with paramagnetic leads
• Negative differential conductance induced by spin-charge separation
• Shot Noise in Negative-Differential-Conductance Devices

Cited by in corpus (45)

• Co-tunneling current and shot noise in quantum dots
• Shot Noise Detection on a Carbon Nanotube Quantum Dot
• Charge and spin transport in strongly correlated one-dimensional quantum systems driven far from equilibrium
• Noise enhancement due to quantum coherence in coupled quantum dots
• Spin effects in single electron tunneling
• Frequency-Dependent Current Noise through Quantum-Dot Spin Valves
• Shot noise in transport through "double quantum dots"
• Negative differential conductivity in far-from-equilibrium quantum spin chains
• Transport Statistics of Interacting Double Dot Systems: Coherent and Non-Markovian Effects
• Calculation of the current noise spectrum in mesoscopic transport: an efficient quantum master equation approach
• Super-Poissonian shot noise in the resonant tunneling due to coupling with a localized level
• Full counting statistics of transport through two-channel Coulomb blockade systems
• Full counting statistics and shot noise of cotunneling in quantum dots and single-molecule transistors
• Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
• Large-deviation analysis for counting statistics in mesoscopic transports
• Counting statistics of cotunneling electrons
• Lindblad equation approach to the optimal working point in nonequilibrium stationary states of an interacting electronic one-dimensional system: Application to the spinless Hubbard chain in the clean and in the weakly disordered limit
• Counting quantum jumps: a summary and comparison of fixed-time and fluctuating-time statistics in electron transport
• Theory of shot noise in single-walled metallic carbon nanotubes weakly coupled to nonmagnetic and ferromagnetic leads
• Negative differential resistance in nanoscale transport in the Coulomb blockade
• Noisy defects in a doped Mott insulator
• Distribution of waiting times between electron cotunnelings
• Spin-dependent shot noise enhancement in a quantum dot
• Enhanced shot noise in asymmetric interacting two level systems
• Enhanced current noise correlations in a Coulomb-Majorana device
• Non-renewal statistics in quantum transport through the eyes of first-passage and waiting time distributions
• Single-electron counting spectroscopy: simulation study of porphyrin in a molecular junction
• Finite size effects, super-and sub-poissonian noise in a nanotube connected to leads
• Fractional Josephson effect versus fractional charge in superconducting-normal metal hybrid circuits
• Strongly enhanced shot noise in chains of quantum dots
• Quantum noise in ac-driven resonant-tunneling double barrier structures: Photon-assisted tunneling vs. electron anti-bunching
• Full Counting statistics of level renormalization in electron transport through double quantum dots
• Negative differential conductance in quantum dots in theory and experiment
• Full counting statistics of renormalized dynamics in open quantum transport system
• Negative Differential Conductance in Nano-junctions: A Current Constrained Approach
• Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads
• Transport through two-level quantum dots weakly coupled to ferromagnetic leads
• Self-consistent electron counting statistics
• Coulomb-Blocked Transport Through a Quantum Dot with Spin-Split Level: Increase of Differential Conductance Peaks by Spin Relaxation
• Blocking-state influence on shot noise and conductance in quantum dots
• Dark channels in resonant tunneling transport through artificial atoms
• Shot noise in charge and magnetization currents of a quantum ring
• Current noise in quantum dot thermoelectric engines
• Current fluctuations of noncollinear single-electron spin-valve transistors
• Nonlinear Transport in Carbon Quantum Dot Electronic Devices: Experiment and Theory