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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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Single-molecule electric revolving door.

Liang-Yan Hsu1, Elise Y Li, Herschel Rabitz

  • 1Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States.

Nano Letters
|October 17, 2013
PubMed
Summary

Researchers developed a single-molecule electric revolving door, a novel molecular machine. This device demonstrates significant conductance changes for effective nanoscale switching applications.

Area of Science:

  • Molecular electronics
  • Nanoscience and nanotechnology

Background:

  • Molecular machines offer potential for nanoscale devices.
  • Controlling molecular conformation is key to device function.

Purpose of the Study:

  • To propose and simulate a novel single-molecule electric revolving door.
  • To investigate its potential as a switching device.

Main Methods:

  • Electron transport simulations using the Landauer formalism.
  • Density functional theory (DFT) calculations.
  • Zero-bias limit analysis.

Main Results:

  • Demonstrated operation of open- and closed-door states via electric fields.
  • Achieved a large on-off conductance ratio of approximately 10^5.

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  • Simulated nanosecond-scale control and detection of molecular states.

    • Conclusions:

    • The single-molecule electric revolving door functions as an effective switching device.
    • Offers new capabilities for molecular-scale electronics.
    • Potential for high-performance nanoscale switching applications.