Universal correlations in vibrational spectra of complex crystals

We study spectral statistics of lattice modes in a disordered crystal and i n a crystal with a complex unit cell. The correlations of the eigenmode fre quencies of a block of a disordered solid is found to obey the GOE Wigner-D yson 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. (C) 1999 Elsevier Science B.V. All rights reserved.