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Evidence for Atomic-Scale Vibron-Mediated Electron Bunching.

A Maiti1, M Amato1, V S Stolyarov2

  • 1Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405, Orsay, France.

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|June 26, 2026
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Summary
This summary is machine-generated.

Strong vibronic coupling causes electron bunching during tunneling, a phenomenon observed at the atomic scale for the first time. This finding provides evidence for electron bunching and opens possibilities for novel electron sources.

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Area of Science:

  • Quantum transport phenomena
  • Atomic-scale electronics
  • Vibrational coupling effects

Background:

  • Electrons typically tunnel one by one (antibunching) due to Coulomb blockade.
  • Theory suggests vibronic coupling can cause electron bunching, but experimental proof was lacking.
  • Atomic impurities coupled to vibrational modes are key systems for studying electron transport.

Purpose of the Study:

  • To provide direct atomic-scale evidence of electron bunching induced by vibronic coupling.
  • To investigate the transport statistics of single-electron tunneling in a model system.
  • To explore potential applications of vibron-mediated electron bunching.

Main Methods:

  • Atomically resolved shot-noise measurements.
  • Probing single-electron tunneling transport statistics.
  • Utilizing nanoelectromechanical systems with atomic impurities and vibrational modes.

Main Results:

  • Observed clear signatures of vibron-assisted tunneling via conductance spectroscopy.
  • Detected super-Poissonian noise at the impurity center, indicating electron bunching.
  • Provided direct experimental evidence for vibronic coupling driving electron bunching.

Conclusions:

  • Vibronic coupling can indeed lead to electron bunching at the atomic scale.
  • Shot-noise measurements are crucial for revealing non-conventional tunneling statistics.
  • Future work could exploit this effect for generating N-paired electrons.