Many-Particle Dephasing after a Quench

Kiendl, Thomas; Marquardt, Florian

doi:10.1103/PhysRevLett.118.130601

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Many-Particle Dephasing after a Quench

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Marquardt, Florian
Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg, Inst Theoret Phys;

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Citation

Kiendl, T., & Marquardt, F. (2017). Many-Particle Dephasing after a Quench. PHYSICAL REVIEW LETTERS, 118(13): 130601. doi:10.1103/PhysRevLett.118.130601.

Cite as: https://hdl.handle.net/21.11116/0000-0000-7E4D-E

Abstract

After a quench in a quantum many-body system, expectation values tend to relax towards long-time averages. However, temporal fluctuations remain in the long-time limit, and it is crucial to study the suppression of these fluctuations with increasing system size. The particularly important case of nonintegrable models has been addressed so far only by numerics and conjectures based on analytical bounds. In this work, we are able to derive analytical predictions for the temporal fluctuations in a nonintegrable model (the transverse Ising chain with extra terms). Our results are based on identifying a dynamical regime of "many-particle dephasing,"where quasiparticles do not yet relax but fluctuations are nonetheless suppressed exponentially by weak integrability breaking.