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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Transient switch-on/off currents in molecular junctions.

E G Petrov¹, Ye V Shevchenko, V May

¹Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Metrologichna Street 14-B, UA-03680 Kiev, Ukraine. epetrov@bitp.kiev.ua

The Journal of Chemical Physics

|June 7, 2011

Summary

This summary is machine-generated.

We present a unified theory for transient and steady-state current in molecular junctions. Transient currents can exceed steady-state values due to rapid molecular charging or discharging processes.

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Area of Science:

Condensed Matter Physics
Quantum Chemistry
Molecular Electronics

Background:

Understanding charge transport in molecular junctions is crucial for molecular electronics.
Existing theories often treat transient and steady-state currents separately.

Purpose of the Study:

To develop a unified theoretical framework for describing current formation in molecular junctions.
To analyze the dynamics of transient and steady-state currents.
To investigate factors influencing transient current magnitudes.

Main Methods:

Utilizing nonequilibrium density matrix theory.
Modeling charge transmission through molecular junctions with two active terminal sites.
Analyzing time evolution of molecular charged state populations.

Main Results:

The current's time evolution is dictated by the populations of relevant molecular charged states.
Transient currents can significantly surpass steady-state values upon sudden voltage changes (switch-on/off).
Fast molecular charging/discharging processes drive these large transient currents.

Conclusions:

The developed theory provides a unified description of current formation in molecular junctions.
Transient current enhancement is linked to the relative speeds of charging/discharging versus steady-state establishment.
Asymmetric electrode coupling and voltage-induced state localization amplify transient currents.