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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Designing quantum dots for solotronics.

J Kobak1, T Smoleński1, M Goryca2

  • 11] Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, Warsaw 00-681, Poland [2].

Nature Communications
|January 28, 2014
PubMed
Summary
This summary is machine-generated.

Solitary dopant optoelectronics (solotronics) can exploit quantum properties of individual ions in quantum dots. Researchers found that magnetic impurities do not quench exciton luminescence, enabling new solotronic systems and single-ion spin memory.

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Area of Science:

  • Quantum physics
  • Optoelectronics
  • Materials science

Background:

  • Solotronics aims for ultimate miniaturization using quantum properties of solitary dopants in semiconductors.
  • Optical control of magnetic ion spins in quantum dots is possible but hindered by exciton luminescence quenching.

Purpose of the Study:

  • To investigate the feasibility of solotronics by studying exciton luminescence in individual magnetic ion-doped quantum dots.
  • To identify optimal systems for single-ion-based spin memory.

Main Methods:

  • Photoluminescence studies on individual CdTe dots with single cobalt ions.
  • Photoluminescence studies on individual CdSe dots with single manganese ions.
  • Single-spin relaxation experiments.

Main Results:

  • Nonradiative exciton recombination through single-magnetic-ion intra-ionic transitions is negligible in zero-dimensional quantum dot structures.
  • Demonstrated the viability of individual magnetic ions in quantum dots for solotronics.

Conclusions:

  • The negligible quenching effect opens solotronics to a wider range of systems.
  • Identified optimal magnetic-ion quantum dot systems for developing single-ion spin memory devices.