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Quantum size effect affecting environment assisted electron capture in quantum confinements.

Axel Molle1, Essam R Berikaa1, Federico M Pont2

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Ultrafast inter-Coulombic electron capture (ICEC) in nanowires facilitates electron transfer. Quantum-size effects reveal two primary capture channels, enhancing ICEC likelihood for future integrated circuits.

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Quantum Mechanics

Background:

  • Ultrafast inter-Coulombic electron capture (ICEC) is a key energy transfer mechanism in quantum-dot systems.
  • ICEC involves long-range electron-electron interactions within nanowires, mediating electron entrapment and release.
  • Previous research highlighted ICEC enhancement via resonance states and inter-Coulombic decay (ICD).

Purpose of the Study:

  • To investigate the quantum-size effect on single- and double-electron states in a quasi-one-dimensional nanowire model.
  • To analyze the influence of confinement size on ICEC electron flux density.
  • To identify and differentiate the primary electron capture channels contributing to ICEC.

Main Methods:

  • Modeling a quasi-one-dimensional nanowire with two embedded Gaussian potential wells.
  • Analyzing electron flux density as a function of varying confinement sizes.
  • Investigating quantum-size effects on electron states and their impact on ICEC.

Main Results:

  • Identified two distinct ICEC capture channels: direct long-range impulse and kinetic to correlation energy conversion with ICD.
  • Demonstrated that the interplay of these channels significantly increases the probability of ICEC.
  • Observed a clear dependence of ICEC electron flux density on the confinement size of the quantum wells.

Conclusions:

  • Quantum-size effects critically influence electron capture dynamics in nanowire-based quantum-dot systems.
  • The combined direct and ICD-mediated capture channels make ICEC a highly probable process in these systems.
  • Nanowires show significant potential for advanced, miniaturized integrated-circuit components due to efficient ICEC.