Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum Gases (Bosons) III

Q 28.5: Talk

Wednesday, March 13, 2019, 11:45–12:00, S HS 037 Informatik

Running coupling inferred from higher order correlations in a spinor BEC — •Maximilian Prüfer¹, Torsten V. Zache², Philipp Kunkel¹, Stefan Lannig¹, Alexis Bonnin¹, Helmut Strobel¹, Jürgen Berges², and Markus K. Oberthaler¹ — ¹Kirchhoff-Institut für Physik, Universität Heidelberg — ²Institut für theoretische Physik, Universität Heidelberg

Strongly correlated systems far from equilibrium can exhibit dynamically generated weak couplings of the relevant degrees of freedom [1]. Here, we study this phenomenon experimentally using quantum simulations in a spinor Bose gas of ⁸⁷Rb with ferromagnetic interactions. Recently it has been shown that this system features universal dynamics in the transversal spin after a quench [2]. Employing a novel detection scheme, we can now simultaneously extract length as well as orientation of the transversal spin spatially resolved. This allows for a systematic analysis of the experimental data building on higher order correlations and with that the access of the couplings of an effective field theory describing the system near a non-thermal fixed point. The observed strong momentum dependence of the coupling suggests the expected dynamically generated weak couplings for low momenta.

[1] Berges, J. et al., PRL 101, 041603 (2008)

[2] Prüfer, M. et al., Nature 563, 217-220 (2018)