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Andris Erglis1, Milan Radonjić2, Stefan Yoshi Buhmann3

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Researchers discovered a second threshold for photon Bose-Einstein condensates at small mode spacings. This finding reveals a new crossover to a fully condensed state, distinct from the large mode spacing transition.

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Area of Science:

  • Quantum optics
  • Condensed matter physics

Background:

  • Photon Bose-Einstein condensates are coherent states of light.
  • Phase transitions in these systems are typically studied at large mode spacings.

Purpose of the Study:

  • To investigate the properties of photon Bose-Einstein condensates under conditions of small mode spacing.
  • To identify new phase transition behaviors in these systems.

Main Methods:

  • Theoretical analysis of photon Bose-Einstein condensate properties.
  • Examination of systems in the small mode spacing limit.

Main Results:

  • A second, previously unknown threshold for phase transition was identified at small mode spacings.
  • This new threshold defines a crossover to a fully condensed state.
  • Mode occupations in the precondensate and supercooling regions were analyzed towards the continuum limit.

Conclusions:

  • The behavior of photon Bose-Einstein condensates is more complex than previously understood, with distinct phase transition mechanisms.
  • Understanding these thresholds is crucial for controlling and utilizing coherent light states.