| Long-range order and low-energy spectrum of diluted 2D quantum AF (2000) | |||||||||
Abstract | |||||||||
| The problem of diluted two-dimensional (2D) quantum antiferromagnet (AF) 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 (MC) data is found. The hydrodynamic description of spin-waves breaks down at characteristic wavelengths $\Lambda\agt\exp(\frac{const}{x})$, $x$ 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 2D.. Comment: PRL Award received, 4 pages, 3 figures | |||||||||
Details der Publikation | |||||||||
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