A study of the 't Hooft loop in SU(2) Yang-Mills theory

Using a new numerical method, we study the behaviour of the spatial and temporal 't Hooft loop at zero and finite temperature in the 4d SU(2) pure gauge theory. In the deconfined phase $T > T_c$, we measure for the spatial 't Hooft loop a dual string tension which vanishes at $T_c$ with 3d Ising-like critical exponent.