Long-Range Order and Low-Energy Spectrum of Diluted 2D Quantum Antiferromagnet

A. L. Chernyshev, Yu-Chang Chen, A. H. Castro Neto

Research output: Contribution to journalArticlepeer-review

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The problem of a diluted two-dimensional quantum antiferromagnet on a square lattice is studied using spin-wave theory. The influence of impurities on static and dynamic properties is investigated and a good agreement with experiments and Monte Carlo data is found. The hydrodynamic description of spin waves breaks down at characteristic wavelengths Λ≳exp(const/x), x being an impurity concentration, while the order parameter is free from anomalies. We argue that this dichotomy originates from strong scattering of the low-energy excitations in two dimensions.

Original languageEnglish
Article number067209
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number6
StatePublished - 6 Aug 2001


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