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  • 1Institute of Theoretical Physics and Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong. edcflo@gmail.com.

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This study explores spectral collapse in the two-photon Rabi model. Light-matter interaction and spin-flipping compete, with light-matter interaction dominating to cause spectral collapse beyond a critical value.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Theoretical chemistry

Background:

  • The two-photon Rabi model describes light-matter interactions.
  • Spectral collapse is a phenomenon where system energy levels converge.

Purpose of the Study:

  • Investigate spectral collapse in the two-photon Rabi model.
  • Analyze the competing effects of light-matter interaction and spin-flipping.

Main Methods:

  • Utilized a squeezed-state trial wave function.
  • Performed a variational study.
  • Analyzed frequency modulation of the radiation mode.

Main Results:

  • Identified light-matter interaction and spin-flipping as competing impacts on the radiation mode.
  • Found light-matter interaction dominates beyond a critical coupling strength, inducing spectral collapse.
  • Observed incomplete spectral collapse at critical coupling, dependent on atomic energy level differences.

Conclusions:

  • The interplay between light-matter interaction and spin-flipping governs spectral collapse.
  • Critical coupling strength is key to spectral collapse emergence.
  • Atomic energy level differences influence the extent of incomplete spectral collapse.