Universal scaling of the dynamic BKT transition in quenched 2D Bose gases.

Autor: Sunami S; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Singh VP; Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Germany.; Quantum Research Centre, Technology Innovation Institute, Abu Dhabi, United Arab Emirates., Garrick D; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Beregi A; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Barker AJ; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Luksch K; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Bentine E; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK., Mathey L; Zentrum für Optische Quantentechnologien and Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany.; The Hamburg Centre for Ultrafast Imaging, Hamburg 22761, Germany., Foot CJ; Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2023 Oct 27; Vol. 382 (6669), pp. 443-447. Date of Electronic Publication: 2023 Oct 26.
DOI: 10.1126/science.abq6753
Abstrakt: The understanding of nonequilibrium dynamics in many-body quantum systems is a fundamental issue in statistical physics. Experiments that probe universal properties of these systems can address such foundational questions. In this study, we report the measurement of universal dynamics triggered by a quench from the superfluid to normal phase across the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional (2D) Bose gas. We reduced the density by splitting the 2D gas in two, realizing a quench across the critical point. The subsequent relaxation dynamics were probed with matter-wave interferometry to measure the local phase fluctuations. We show that the time evolution of both the phase correlation function and vortex density obeys universal scaling laws. This conclusion is supported by classical-field simulations and interpreted by means of real-time renormalization group theory.
Databáze: MEDLINE
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