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Super-radiant mode in InAs-monolayer-based Bragg structures.

G Pozina1, M A Kaliteevski2,3,4, E V Nikitina2,3

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This summary is machine-generated.

Researchers observed a collective super-radiant mode in 60 InAs quantum wells (QWs). This mode, arising from coherent QW interaction, shows enhanced light emission with increased excitation power.

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Area of Science:

  • Solid State Physics
  • Quantum Optics
  • Materials Science

Background:

  • Quantum wells (QWs) are crucial semiconductor nanostructures for optoelectronic devices.
  • Superradiance describes enhanced emission from a collection of excited emitters.
  • Bragg structures offer unique optical properties through periodic layering.

Purpose of the Study:

  • To provide direct experimental evidence of a collective super-radiant mode.
  • To investigate the behavior of this mode in a large array of quantum wells.
  • To understand the role of coherent interactions in superradiance.

Main Methods:

  • Fabrication of a Bragg structure with 60 InAs monolayer-based quantum wells in a GaAs matrix.
  • Time-resolved photoluminescence measurements.
  • Analysis of excitation power dependence on emission intensity and decay rate.

Main Results:

  • Observation of an additional super-radiant mode.
  • This mode originates from the coherent collective interaction of quantum wells.
  • The super-radiant mode exhibits super-linear intensity dependence and a faster radiative decay rate with increasing excitation power.
  • The mode is absent when only a few quantum wells are excited.

Conclusions:

  • The study confirms the existence of a collective super-radiant mode in a dense array of quantum wells.
  • Coherent collective interaction is essential for the manifestation of this super-radiant mode.
  • This finding has implications for designing advanced quantum optical devices and understanding light-matter interactions in nanostructures.