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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Published on: January 19, 2018

A nanoelectromechanical single-atom switch.

Christian A Martin1, Roel H M Smit, Herre S J van der Zant

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. martin@physics.leidenuniv.nl

Nano Letters
|July 31, 2009
PubMed
Summary
This summary is machine-generated.

Researchers created single-atom relays using electromechanical properties of gated mechanical break junctions. These devices allow reversible switching between atomic contacts and tunneling regimes, controlled by gate voltage.

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Area of Science:

  • Condensed matter physics
  • Nanotechnology
  • Electrical engineering

Background:

  • Mechanical break junctions are crucial for studying quantum transport phenomena.
  • Controlling atomic-scale contacts is essential for developing novel electronic devices.
  • Electromechanical properties offer a pathway for precise manipulation at the nanoscale.

Purpose of the Study:

  • To engineer single-atom relays utilizing electromechanical properties.
  • To investigate the reversible switching between monatomic contacts and tunneling regimes.
  • To understand the influence of gate voltage and device geometry on conductance.

Main Methods:

  • Fabrication and characterization of gated mechanical break junction devices.
  • Exploitation of electromechanical properties for atomic contact formation.
  • Measurement of source-drain conductance as a function of gate voltage.

Main Results:

  • Successful formation of single-atom relays with tunable conductance.
  • Demonstration of reversible switching between a monatomic contact (conductance ~2e^2/h) and the tunneling regime.
  • Observation of smooth gate voltage dependence of conductance in the tunneling regime.

Conclusions:

  • Electromechanical properties of gated break junctions enable the creation of single-atom relays.
  • Continuum model explains device characteristics, highlighting substrate elasticity and electrode geometry's role.
  • These findings pave the way for advanced nanoscale electronic components.