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Breakdown of Disorder-Suppressed Floquet Heating under Two-Frequency Driving.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Non-equilibrium dynamics

Background:

  • Periodic driving (Floquet engineering) creates novel quantum phases but leads to heating in interacting systems.
  • Disorder can stabilize these systems, forming long-lived prethermal plateaus by delaying energy absorption.

Purpose of the Study:

  • Investigate the failure of disorder-protected prethermal phases under complex driving conditions.
  • Identify the mechanisms behind heating rate anomalies in driven, disordered quantum systems.

Main Methods:

  • Utilized a natural-abundance ^{13}C nuclear-spin network in diamond as a quantum system.
  • Employed pulse-train control with dual driving frequencies to study Floquet dynamics.
  • Developed a switching-noise model to explain observed resonant absorption.

Main Results:

  • Observed sharp peaks in the heating rate at resonance conditions for double- and triple-spin flips.
  • Demonstrated that bimodal Floquet interference and fluctuating disorder trigger these heating resonances.
  • Linked resonant absorption to stochastic electron-spin dynamics affecting nuclear spin clusters.

Conclusions:

  • Established a resonance-activated limit for disorder-stabilized Floquet phases.
  • Revealed that stochastic spin dynamics can abruptly break prethermalization.
  • Proposed new quantum sensing strategies based on prethermalization breakdown.