Long-range order and low-energy spectrum of diluted 2D quantum antiferromagnet - art. no. 067209

Citation
Al. Chernyshev et al., Long-range order and low-energy spectrum of diluted 2D quantum antiferromagnet - art. no. 067209, PHYS REV L, 8706(6), 2001, pp. 7209
Citations number
27
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8706
Issue
6
Year of publication
2001
Database
ISI
SICI code
0031-9007(20010806)8706:6<7209:LOALSO>2.0.ZU;2-9
Abstract
The problem of a diluted two-dimensional quantum antiferromagnet on a squar e lattice is studied using spin-wave theory. The influence of impurities on static and dynamic properties is investigated and a good agreement with ex periments and Monte Carlo data is found. The hydrodynamic description of sp in waves breaks down at characteristic wavelengths Lambda greater than or s imilar to exp(const/x), x being an impurity concentration, while the order parameter is free from anomalies. We argue that this dichotomy originates f rom strong scattering of the low-energy excitations in two dimensions.