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Universal correlations in vibrational spectra of complex crystals

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>03/1999
<mark>Journal</mark>Physica B: Condensed Matter
Volume263-264
Number of pages3
Pages136-138
<mark>Original language</mark>English

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.