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A few-emitter solid-state multi-exciton laser.

S Lichtmannecker1, M Florian2, T Reichert1

  • 1Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748, Garching, Germany.

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Summary
This summary is machine-generated.

This study shows how four quantum dots in a photonic crystal can achieve lasing through multi-exciton states, even with detuning. It also reveals radiative coupling and correlations between quantum dots.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics
  • Nanophotonics

Background:

  • Photonic crystal nanocavities are crucial for controlling light-matter interactions.
  • Quantum dots are promising solid-state emitters for quantum technologies.
  • Achieving efficient lasing with a minimal number of emitters is a key challenge.

Purpose of the Study:

  • To investigate non-conventional lasing in a system with only four quantum dot emitters.
  • To explore the role of multi-exciton states in facilitating lasing.
  • To examine radiative coupling and electronic correlations between quantum dots.

Main Methods:

  • Experimental realization of lasing in a photonic-crystal nanocavity with four quantum dots.
  • Microscopic theoretical modeling for comparison with experimental results.
  • Analysis of pump-rate dependence of the β-factor to probe multi-exciton states and correlations.

Main Results:

  • Demonstration of lasing facilitated by multi-exciton states, independent of emitter detuning.
  • Observation of signatures for radiative coupling between quantum dots in the spontaneous-emission regime.
  • Evidence for distinct multi-exciton states at varying excitation powers and electronic inter-emitter correlations.

Conclusions:

  • Lasing with a few quantum dots is achievable via multi-exciton emission.
  • Radiative coupling and electronic correlations play significant roles in few-emitter systems.
  • The β-factor is a sensitive indicator of multi-exciton dynamics and inter-emitter interactions.