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Related Experiment Videos

Quantum quenches in a spinor condensate.

Austen Lamacraft1

  • 1Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, United Kingdom and All Souls College, Oxford, United Kingdom. a.lamacraft1@physics.ox.ac.uk

Physical Review Letters
|May 16, 2007
PubMed
Summary
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We studied spin-1 condensates quenched into ferromagnetic phases. Rapid quenches show XY ordering or light-cone correlations, while slow quenches follow the Kibble-Zurek mechanism, creating vortices and impacting magnetic order dynamics.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Spin-1 condensates

Background:

  • Spin-1 condensates exhibit paramagnetic and ferromagnetic phases.
  • Quantum phase transitions are crucial for understanding emergent phenomena.

Purpose of the Study:

  • To investigate the ordering of a spin-1 condensate quenched from a paramagnetic to a ferromagnetic phase.
  • To elucidate the nature of the equilibrium quantum phase transition and the dynamics post-quench.

Main Methods:

  • Theoretical analysis of spin-1 condensate dynamics.
  • Investigating quantum phase transitions via magnetic field reduction.
  • Applying the Kibble-Zurek mechanism to finite-rate quenches.

Main Results:

Related Experiment Videos

  • Rapid quenches result in XY ordering or light-cone correlations depending on the quench endpoint.
  • Finite-rate quenches are governed by the Kibble-Zurek mechanism, influencing the ordering scale.
  • Vortex creation and magnetization dynamics differ based on the final magnetic field, with distinct coarsening exponents.

Conclusions:

  • The dynamics of spin-1 condensates after quenching depend significantly on the quench rate and endpoint.
  • Kibble-Zurek mechanism accurately describes ordering scales in finite-rate quenches.
  • The study provides insights into non-equilibrium quantum dynamics and vortex formation in magnetic systems.