Quantum critical behavior in a two-layer antiferromagnet
Quantum critical behavior in a two-layer antiferromagnet
We analyze quantum Monte Carlo data in the vicinity of the quantum transition between a N\'eel state and a quantum paramagnet in a two-layer, square-lattice spin-1/2 Heisenberg antiferromagnet. The real-space correlation function and the universal amplitude ratio of the structure factor and the dynamic susceptibility show clear evidence of quantum …