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Contact Electrification by Quantum-Mechanical Tunneling.

Morten Willatzen1,2, Zhong Lin Wang1,2,3

  • 1CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China.

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Summary
This summary is machine-generated.

This study models quantum mechanical tunneling for charge transfer between solids, crucial for electron transport and contact electrification. Tunneling dynamics are highly sensitive to vacuum gap thickness and surface charge, impacting triboelectricity.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Electron transport and contact electrification between solids are fundamental phenomena.
  • Quantum mechanical tunneling plays a role in charge transfer across interfaces.
  • Understanding these processes is key for applications like triboelectricity.

Purpose of the Study:

  • To propose a simple model for charge transfer via quantum-mechanical tunneling between two solids.
  • To investigate electron transport and contact electrification in metal-dielectric systems.
  • To analyze the sensitivity of tunneling dynamics to interface properties.

Main Methods:

  • Developed a one-dimensional effective-mass Hamiltonian model.
  • Analytically calculated the electron tunneling transmission coefficient.
  • Utilized the Tsu-Esaki equation to determine electron transport rate, considering Fermi functions.
  • Incorporated Coulomb repulsion effects.

Main Results:

  • The model is applicable to electron transport and contact electrification.
  • Tunneling transmission is sensitive to vacuum potential and gap thickness.
  • Time constants for tunneling and electrification vary significantly with vacuum gap size (e.g., 1 Å to 10 Å).
  • Coulomb repulsion between surface electrons influences tunneling dynamics.

Conclusions:

  • The proposed model provides insights into quantum tunneling-driven charge transfer.
  • Interface properties, particularly vacuum gap characteristics, critically affect electron transport and electrification.
  • The findings are relevant for understanding and engineering triboelectric devices.