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Solid state electrically injected exciton-polariton laser.

Pallab Bhattacharya1, Bo Xiao1, Ayan Das1

  • 1Center for Photonic and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA.

Physical Review Letters
|August 29, 2014
PubMed
Summary
This summary is machine-generated.

Researchers achieved inversionless ultralow threshold coherent emission, or polariton lasing, using electrical injection in a GaAs quantum well microcavity. This breakthrough overcomes previous limitations by utilizing modulation doping and a magnetic field.

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Area of Science:

  • Solid State Physics
  • Quantum Optics
  • Materials Science

Background:

  • Polariton lasing typically requires nonresonant optical excitation.
  • Achieving coherent emission via electrical injection in semiconductor microcavities presents significant challenges.
  • Overcoming the relaxation bottleneck is crucial for forming a polariton condensate.

Purpose of the Study:

  • To demonstrate inversionless ultralow threshold coherent emission (polariton lasing) using electrical injection.
  • To investigate the role of modulation doping and magnetic fields in achieving polariton lasing.
  • To overcome the relaxation bottleneck for the formation of a degenerate polariton condensate.

Main Methods:

  • Utilized a GaAs-based quantum well microcavity diode.
  • Employed modulation doping to enhance polariton-electron scattering.
  • Applied a magnetic field in the Faraday geometry to increase exciton-polariton saturation density.
  • Analyzed results using angle-resolved luminescence, light-current characteristics, spatial coherence, and output polarization.

Main Results:

  • Successfully achieved coherent emission from the microcavity diode with electrical injection.
  • Demonstrated the formation of a macroscopic and degenerate polariton condensate.
  • Evidence of polariton lasing was confirmed through various optical and electrical measurements.

Conclusions:

  • Electrical injection is a viable method for achieving polariton lasing, offering an alternative to optical pumping.
  • Modulation doping and magnetic fields are effective strategies to overcome the relaxation bottleneck and facilitate condensate formation.
  • This work paves the way for electrically driven coherent light sources based on polaritonics.