Charge-memory effect in a polaron model: equation-of-motion method for Green functions

Abstract

We analyze a single-level quantum system placed between metallic leads and strongly coupled to a localized vibrational mode, which models a singlemolecule junction or an STM setup. We consider a polaron model describing the interaction between electronic and vibronic degrees of freedom and develop and examine different truncation schemes in the equation-of-motion method within the framework of non-equilibrium Green functions. We show that upon applying gate or bias voltage, it is possible to observe charge-bistability and hysteretic behavior which can be the basis of a charge-memory element. We further perform a systematic analysis of the bistability behaviour of the system for different internal parameters such as the electron-vibron and the lead-molecule coupling strength.

12 pages, 5 figures

References in corpus (7)

• Time-dependent transport in interacting and non-interacting mesoscopic systems
• Measurement of the conductance of a hydrogen molecule
• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Inelastic electron tunneling via molecular vibrations in single-molecule transistors
• Tuning the conductance of a molecular switch
• Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction
• Semiclassical analysis of the Nonequilibrium Local Polaron

Cited by in corpus (9)

• Tailoring THz radiation by controlling tunnel photoionization events in gases
• Numerically exact, time-dependent treatment of vibrationally coupled electron transport in single-molecule junctions
• Bistability signatures in nonequilibrium charge transport through molecular quantum dots
• Green function techniques in the treatment of quantum transport at the molecular scale
• Long transient dynamics in the Anderson-Holstein model out of equilibrium
• Transient dynamics of a molecular quantum dot with a vibrational degree of freedom
• Charge-memory polaron effect in molecular junctions
• Vibration induced memory effects and switching in ac-driven molecular nanojunctions
• Single-spin polaron memory effect