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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Optics

Background:

  • Harmonic modulation of coherent systems leads to phenomena like AC-Stark effect and Mollow triplets.
  • These phenomena are crucial for coherent control and frequency conversion applications.

Purpose of the Study:

  • To demonstrate a new regime of temporal coherence in oscillators driven at extreme energy modulation amplitudes.
  • To investigate the physical phenomena arising from harmonic modulation of a confined exciton-polariton Bose-Einstein condensate (BEC) with acoustic waves.

Main Methods:

  • Modulating a confined exciton-polariton Bose-Einstein condensate (BEC) using an acoustic wave.
  • Analyzing spectral and temporal domains to observe resonances and correlations.
  • Developing a theoretical framework to explain the observed phenomena.

Main Results:

  • Observed a novel regime of temporal coherence in the driven BEC.
  • Identified spectral 'acceleration beats' with tunable energy spacing.
  • Detected temporal correlations on timescales shorter than the acoustic period, dependent on modulation amplitude.

Conclusions:

  • The acceleration beats are linked to accelerated energy-change rates during harmonic cycles.
  • The BEC's high sensitivity to acoustic driving preserves its temporal coherence.
  • Acceleration beats are a general feature of accelerated energy changes, potentially observable in phenomena like Cherenkov and Hawking radiation.