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Controlling Quantum-Confined Stark Effect in Coupled II-VI Quantum Dots by Interface Engineering.

Pingping Han1, Tingli Du1, Si Zhou2,3

  • 1Key Laboratory of Materials Modification by Laser, Ministry of Education, Ion and Electron Beams (Dalian University of Technology), Dalian, 116024, China.

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|May 3, 2025
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Summary

Quantum-confined Stark effect (QCSE) is enhanced in coupled quantum dot (QD) molecules, offering tunable electro-optic modulation. Strong coupling boosts fluorescence and enables control over electron and exciton behavior in QD assemblies.

Keywords:
artificial moleculecoupling strengthelectric fieldexcitonquantum dotquantum‐confined Stark effect

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Optoelectronics

Background:

  • Quantum-confined Stark effect (QCSE) enables electro-optic modulation in confined systems.
  • Interdot coupling in quantum dots (QDs) offers advanced functionalities for optical switches.

Purpose of the Study:

  • To explore QCSE in artificial molecules formed by two coupled II-VI main group QDs.
  • To investigate the tunability of QCSE by interdot coupling and dimerization.
  • To understand how strong coupling affects charge separation and fluorescence in QD molecules.

Main Methods:

  • Fabrication and characterization of coupled QD systems.
  • Application of external electric fields to induce QCSE.
  • Spectroscopic analysis to study excitonic states and fluorescence.

Main Results:

  • Remarkable enhancement of QCSE in QD molecules compared to single QDs.
  • High tunability of QCSE through interdot coupling strength and QD dimerization.
  • Retarded charge separation and resonant electron-hole states under strong coupling, boosting fluorescence.

Conclusions:

  • Coupled QDs exhibit enhanced and tunable QCSE, surpassing single QDs.
  • Interdot coupling is a key parameter for manipulating excitonic states and optical properties.
  • These findings provide guidelines for developing advanced optoelectronic devices, photonics, and quantum information technologies using coupled QDs.