Universal correlations in vibrational spectra of complex crystals

Fagas, G and Falko, Vladimir and Lambert, C J (1999) Universal correlations in vibrational spectra of complex crystals. Physica B: Condensed Matter, 263-26. pp. 136-138. ISSN 0921-4526

Abstract

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.