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Weak lasing in one-dimensional polariton superlattices.

Long Zhang1, Wei Xie1, Jian Wang1

  • 1State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structure (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China;

Proceedings of the National Academy of Sciences of the United States of America
|March 20, 2015
PubMed
Summary

Researchers observed a new "weak lasing" phase in exciton-polariton condensates. This phase, characterized by period doubling, occurs in one-dimensional systems with periodic potentials at room temperature.

Keywords:
condensatepolaritonsuperlatticesymmetry breakingweak lasing

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Area of Science:

  • Condensation physics
  • Many-body quantum systems
  • Semiconductor physics

Background:

  • Bosons with finite lifetimes can condense and lase above a threshold determined by losses.
  • Interactions can lead to a "weak lasing" regime with a stable many-body state.
  • This regime involves spontaneous symmetry breaking and self-organization of bosonic modes.

Purpose of the Study:

  • To report the first observation of the weak lasing phase in a one-dimensional exciton-polariton condensate.
  • To investigate the behavior of such condensates under a periodic potential.

Main Methods:

  • Experiments conducted at room temperature using a ZnO microwire on a silicon grating.
  • Real and reciprocal space photoluminescence imaging to analyze condensate properties.
  • Varying pumping power to observe phase transitions.

Main Results:

  • Observation of a spatial period doubling in the exciton-polariton condensate.
  • The doubled period is twice that of the underlying periodic potential.
  • Period doubling occurs at a critical pumping power, indicating a phase transition.
  • At lower powers, the condensate periodicity matches the grating.

Conclusions:

  • The study demonstrates the existence of the weak lasing phase in a realistic system.
  • Period doubling is a signature of this phase in one-dimensional exciton-polariton condensates.
  • The findings open avenues for exploring many-body quantum phenomena in engineered potentials.