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Shapiro steps in strongly-interacting Fermi gases.

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Researchers observed Shapiro steps in driven Josephson junctions of ultracold atoms. This finding reveals synchronization mechanisms in quantum many-body systems and opens new avenues for studying nonequilibrium dynamics.

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Area of Science:

  • Quantum physics
  • Ultracold atoms
  • Condensed matter physics

Background:

  • Driven many-body systems exhibit complex dynamics.
  • Josephson junctions are crucial for quantum electronics.
  • Ultracold atoms provide a platform for simulating quantum phenomena.

Purpose of the Study:

  • To observe Shapiro steps in Josephson junctions of Fermi superfluids.
  • To investigate the underlying synchronization mechanisms.
  • To explore emergent nonequilibrium dynamics in driven quantum systems.

Main Methods:

  • Experimental realization of Josephson junctions with ultracold Fermi superfluids.
  • Periodic driving of the system.
  • Measurement of current-potential characteristics.
  • Direct measurement of the current-phase relationship.
  • Detection of phase-slippage processes.
  • Circuital modeling and numerical simulations.

Main Results:

  • Observation of quantized plateaus (Shapiro steps) in current-potential characteristics.
  • Plateau height and width correlate with drive frequency and junction nonlinearity.
  • Demonstration of synchronization between relative phase and external drive.
  • Detection of vortex-antivortex pairs indicating phase slippage.

Conclusions:

  • Shapiro steps arise from a synchronization mechanism in driven Josephson junctions.
  • The study provides insights into emergent nonequilibrium dynamics.
  • This work opens prospects for simulating and understanding driven quantum many-body systems.