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Dissipative coupling-induced phonon lasing.

Qiankun Zhang1, Cheng Yang1, Jiteng Sheng1,2

  • 1State Key Laboratory of Precision Spectroscopy, Institute of Quantum Science and Precision Measurement, East China Normal University, Shanghai 200062, China.

Proceedings of the National Academy of Sciences of the United States of America
|December 20, 2022
PubMed
Summary
This summary is machine-generated.

This study demonstrates phonon lasing from dissipative coupling in an optomechanical system, challenging the notion that dissipation hinders lasing. It showcases a novel method for generating phonon lasers in non-Hermitian open systems.

Keywords:
dissipative couplingmultimode phonon lasernon-Hermitian phase transition

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Area of Science:

  • Optomechanics
  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Phonon lasers, analogous to photonic lasers, are typically achieved through coherent pumping.
  • Dissipation is generally considered detrimental to laser operation.

Purpose of the Study:

  • To experimentally demonstrate phonon lasing generated via dissipative coupling in a multimode optomechanical system.
  • To explore non-Hermitian characteristics and phase transitions in engineered dissipative systems.

Main Methods:

  • Utilizing a two-membrane-in-the-middle optomechanical system with precisely engineered dissipations.
  • Tuning cavity light intensity modulation to induce purely dissipative cavity-mediated interactions.
  • Analyzing system behavior around an exceptional point and non-Hermitian phase transition.

Main Results:

  • Observed level attraction and damping repulsion, signatures of dissipative coupling.
  • Achieved simultaneous excitation of two phonon modes into self-sustained oscillation above a critical interaction strength.
  • Characterized distinct phonon correlation phases (oscillatory, biexponential, coherence) in nonlasing and lasing regimes.

Conclusions:

  • Established a novel mechanism for phonon lasing driven by dissipation in non-Hermitian systems.
  • The findings offer new avenues for studying phonon lasers and have potential applications in optics, acoustics, and quantum many-body physics.