Research output: Contribution to journal › Journal article
|<mark>Journal publication date</mark>||03/1999|
|<mark>Journal</mark>||Physica B: Condensed Matter|
|Number of pages||3|
We study spectral statistics of lattice modes in a disordered crystal and in a crystal with a complex unit cell. The correlations of the eigenmode frequencies of a block of a disordered solid is found to obey the GOE Wigner-Dyson statistics. In contrast, the set of eigenfrequencies of a crystal with a complex unit cell taken at the same point Q not equal 0 in the Brillouin zone exhibit correlations specific to the GUE universality class.