1995/02/06 by Anders W. Sandvik, Andrey V. Chubukov, Subir Sachdev · 2 citations
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Heisenberg model #Ising model #Mathematics #Monte Carlo method #Nonlinear system #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum Monte Carlo #Quantum fluctuation #Quantum mechanics #Sigma model #Square lattice #Statistics #Structure factor #Theoretical and Computational Physics #cond-mat
paper · pdf · doi:10.1103/physrevb.51.16483
published as Physical Review B 51, 16483 (1995) · 11 pages, REVtex file, 5 figures in a uuencoded, gziped file. One citation added.
arxiv created 1995/02/06 · openalex publication_date 1995/06/01 · openalex created_date 2016/06/24 · arxiv updated 2016/08/31 · openalex updated_date 2026/08/05
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 critical behavior at low temperatures. The numerical results are in good quantitative agreement with 1/N calculations for the O(N) nonlinear \ensuremathσ model. A discrepancy, reported earlier, between the critical properties of the antiferromagnet and the \ensuremathσ model is resolved. We also discuss the values of prefactors of the dynamic susceptibility and the structure factor in a single-layer antiferromagnet at low T.