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Universal Postquench Prethermalization at a Quantum Critical Point.

Pia Gagel1, Peter P Orth1, Jörg Schmalian2

  • 1Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.

Physical Review Letters
|December 11, 2014
PubMed
Summary
This summary is machine-generated.

We studied open quantum systems quenched towards a critical point. The system exhibits scaling dynamics and a new critical exponent governing prethermalization, leading to delayed thermalization.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Open quantum systems near critical points exhibit complex dynamics.
  • Understanding non-equilibrium behavior after a quantum quench is crucial.

Purpose of the Study:

  • Investigate the non-equilibrium dynamics of an open system quenched towards a quantum critical point.
  • Identify and characterize novel scaling behavior and critical exponents governing the dynamics.

Main Methods:

  • Theoretical analysis of an open system model.
  • Focus on bath-dominated diffusive dynamics post-quench.
  • Identification of scaling laws and critical exponents.

Main Results:

  • Observed scaling behavior in non-equilibrium dynamics governed by a new critical exponent.
  • Demonstrated universal prethermalized coarsening dynamics of the order parameter.
  • Identified power-law rise of order and correlations after initial state collapse.
  • Showed crossover to thermalization occurs late for shallow quenches.

Conclusions:

  • A new critical exponent governs quantum critical prethermalization in open systems.
  • Prethermalization leads to delayed thermalization and specific scaling behaviors.
  • Findings have implications for understanding non-equilibrium quantum phenomena.