Prescaling in a Far-from-Equilibrium Bose Gas

Christian-Marcel Schmied, Aleksandr N. Mikheev, and Thomas Gasenzer
Phys. Rev. Lett. 122, 170404 – Published 3 May 2019
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Abstract

Nonequilibrium conditions give rise to classes of universally evolving configurations of quantum many-body systems at nonthermal fixed points. While the fixed point and thus full scaling in space and time is generically reached at very long evolution times, we propose that systems can show prescaling much earlier in time, in particular, on experimentally accessible timescales. During the prescaling evolution, some well-measurable properties of spatial correlations already scale with the universal exponents of the fixed point while others still show scaling violations. Prescaling is characterized by the evolution obeying conservation laws associated with the remaining symmetry which also defines the universality class of the asymptotically reached nonthermal fixed point. Here, we consider N=3 species of spatially uniform three-dimensional Bose gases, with identical inter- and intraspecies interactions. During prescaling, the full U(N) symmetry of the model is broken to U(N1) while the conserved transport, reflecting explicit and emerging symmetries, leads to the buildup of rescaling quasicondensate distributions.

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  • Received 27 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.170404

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied PhysicsNonlinear DynamicsGeneral PhysicsParticles & FieldsStatistical Physics & Thermodynamics

Authors & Affiliations

Christian-Marcel Schmied1,2, Aleksandr N. Mikheev1, and Thomas Gasenzer1,*

  • 1Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
  • 2Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, Dunedin 9016, New Zealand

  • *t.gasenzer@uni-heidelberg.de

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Issue

Vol. 122, Iss. 17 — 3 May 2019

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