Quantum size effect affecting environment assisted electron capture in quantum confinements

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.