Abstract
The anomalous fluctuations of the zero field order parameter in phases with a broken continuous symmetry were analyzed. It was shown that the variance of the extensive spontaneous magnetization scales as L4 with the system size L, in dimensions 2<d<4. The dynamical susceptibility contained a singular contribution (q2-ω2/c 2)-1/2 for ground states in two dimensions with Goldstone modes vanishing linearly with momentum. The results show that the dynamic structure factor exhibited a critical continuum above the undamped spin wave pole.
| Original language | English |
|---|---|
| Article number | 027203 |
| Pages (from-to) | 272031-272034 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 92 |
| Issue number | 2 |
| State | Published - 16 Jan 2004 |
| Externally published | Yes |