Speaker
Dr
Falk Bruckmann
(University of Regensburg)
Description
We simulated the asymptotically free two-dimensional O(3) model at nonzero chemical potential through dual variables free of the sign problem. The system undergoes a quantum phase transition when mu reaches the particle mass (generated dynamically similar to QCD). The density follows a square root universal for repulsive bosons in one spatial dimension. We have also measured the spin stiffness, known to be sensitive to the spatial correlation length, in different scaling trajectories to zero temperature and infinite size. It points to a dynamical critical exponent z=2, which can be explained by particle worldlines. Comparisons to thermodynamic Bethe ansaetze are shown as well.
Primary author
Dr
Falk Bruckmann
(University of Regensburg)
