Long-range order and low-energy spectrum of diluted 2D quantum AF

Details Long-range order and low-energy spectrum of diluted 2D quantum AF Long-range order and low-energy spectrum of diluted 2D quantum AF

2000-08-28

arxiv.org/abs/cond-mat/0008412v2

Phys. Rev. Lett 87, 067209 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

PRL Award received, 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.87.067209

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.

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