Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 32: Ultra-cold atoms, ions and BEC VI (with Q)

A 32.1: Vortrag

Donnerstag, 21. März 2013, 11:00–11:15, B 305

Experimental observation of universal scaling at a quantum phase transition — •Eike Nicklas, Moritz Höfer, Wolfgang Müssel, Helmut Strobel, Ion Stroescu, Jiri Tomkovic, Maxime Joos, Daniel Linnemann, David B Hume, and Markus K Oberthaler — Kirchhoff-Institut für Physik, Heidelberg, Germany

A prominent feature of phase transitions is a universal scaling in the divergence of characteristic length and time scales when approaching a critical point. Here we report on the experimental observation of such scaling close to a quantum phase transition in a one-dimensional binary condensate of Rubidium. The quantum phase transition is realized by a microwave dressing field transforming the system from immiscible to miscible, where the distance to the critical point can be well controlled via the amplitude of the dressing field. We investigate the dynamics of in-situ spin-spin correlations and observe scaling behaviour of the correlation length. Both the deduced critical coupling strength and the power law exponent are consistent with theoretical predictions.