Extended Data Figure 1: Parameter dependence of phase locking in thermal sine-Gordon theory.
From: Experimental characterization of a quantum many-body system via higher-order correlations
We use the experimental observable ãcos(Ï)ã to quantify the phase locking in a direct and model-independent way. Its dependence on the dimensionless parameter qâ=âλT/lJ (see Methods section âsine-Gordon modelâ) is displayed for the full sine-Gordon model (dashed green line) and for the quadratic Bogoliubov model (dashed-dotted grey line), obtained by expanding the cosine to second order and valid for large phase locking. To compare experiment and theory, the finite imaging resolution needs to be taken into account (solid green line). Some experimental parameters used in the main text are marked and connected to the respective values of q.
