Inelastic Confinement-Induced Resonances in Quantum Dots

TL;DR

This paper investigates inelastic confinement-induced resonances (ICIRs) in quantum dots, demonstrating their occurrence in electron-hole and electron-electron systems, and proposes their potential for controlling electron distributions and single-photon generation.

Contribution

It extends the concept of ICIRs from atomic systems to quantum dots, revealing their universal nature and potential applications in quantum control.

Findings

ICIRs are identified in electron-hole systems in quantum dots.

Resonances due to center-of-mass and relative motion coupling are found in electron-electron systems.

Significant changes in electron and hole distances occur at ICIRs, enabling control of quantum dot properties.

Abstract

Recently, it was shown that the coupling of center-of-mass and relative motion in atomic systems leads to inelastic confinement-induced resonances (ICIRs) [Phys. Rev. Lett. 109, 073201 (2012)]. In the present work, the possible occurrence of ICIRs in quantum dots is investigated. Particularly, electron-hole and electron-electron two-body systems with long-range Coulomb interaction are considered using the material parameters of GaAs. ICIRs are identified for the electron-hole system verifying the universal nature of the ICIR and, additionally, resonances due to the coupling of center-of-mass and relative motion are found also for the electron-electron system. In analogy to the coherent molecule formation appearing at ICIR in atomic systems a significant change in the mean distance between electrons and holes at the resonance is observed. By using the redistribution of the particle densities at the resonance position in modern quantum-dot experiments, the ICIR can provide a new technique for the control of the electron distribution in quantum dots and for the generation of single photons on demand.