Abstract
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 language | English |
|---|---|
| Article number | 067209 |
| Pages (from-to) | 1-4 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 87 |
| Issue number | 6 |
| DOIs | |
| State | Published - 6 Aug 2001 |