# KIP publications

 year 2018 author(s) Christian-Marcel Schmied, Maximilian Prüfer, Markus K. Oberthaler and Thomas Gasenzer title Bidirectional universal dynamics in a spinor Bose gas close to a nonthermal fixed point KIP-Nummer HD-KIP 18-171 KIP-Gruppe(n) F17,F20,F27 document type Paper source Phys. Rev. A 99 (2019) 033611, arXiv:1812.08571 doi 10.1103/PhysRevA.99.033611 Abstract (en) We numerically study the universal scaling dynamics of an isolated one-dimensional ferromagnetic spin-1 Bose gas. Preparing the system in a far-from-equilibrium initial state, simultaneous coarsening and refining is found to enable and characterize the approach to a nonthermal fixed point. A macroscopic length scale which scales in time according to LΛ(t)∼tβ, with β≃1/4, quantifies the coarsening of the size of spin textures. At the same time kinklike defects populating these textures undergo a refining process measured by a shrinking microscopic length scale Lλ∼tβ′, with β′≃−0.17. The combination of these scaling evolutions enables particle and energy conservation in the isolated system and constitutes a bidirectional transport in momentum space. The value of the coarsening exponent β suggests the dynamics to belong to the universality class of diffusive coarsening of the one-dimensional XY model. However, the universal momentum distribution function exhibiting nonlinear transport marks the distinction between diffusive coarsening and the approach of a nonthermal fixed point in the isolated system considered here. This underlines the importance of the universal scaling function in classifying nonthermal fixed points. Present-day experiments with quantum gases are expected to have access to the predicted bidirectional scaling. bibtex @article{SchmiedPhysRevA99033611, author = {Schmied, Christian-Marcel and Pr\"ufer, Maximilian and Oberthaler, Markus K. and Gasenzer, Thomas}, title = {Bidirectional universal dynamics in a spinor Bose gas close to a nonthermal fixed point}, journal = {Phys. Rev. A, Volume: 99, Issue: 3, arXiv:1812.08571}, year = {2019}, volume = {}, pages = {033611}, month = {Mar}, doi = {10.1103/PhysRevA.99.033611}, url = {https://link.aps.org/doi/10.1103/PhysRevA.99.033611} } URL doi:10.1103/PhysRevA.99.033611 URL arXiv:1812.08571 [cond-mat.quant-gas] Datei pdf
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