Research output: Contribution to journal › Journal article
|Journal publication date||03/1999|
|Journal||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.