Deconfined classical criticality in the anisotropic quantum spin-$\frac{1}{2}$ XY model on the square lattice

Christopher Mudry, Ömer M. Aksoy, Claudio Chamon +1

The anisotropic quantum spin-1/2 XY model on a linear chain was solved by Lieb, Schultz, and Mattis in 1961 and shown to display a continuous quantum phase transition at the O(2) s…