Two-phonon bound states in rare-gas crystals

Jindal, V. K. ; Pathak, K. N. (1977) Two-phonon bound states in rare-gas crystals Physical Review B: Condensed Matter and Materials Physics, 15 (2). pp. 1202-1206. ISSN 1098-0121

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A numerical calculation has been done searching for the existence of two-phonon bound states in rare-gas crystals for various values of the wave vector q→ in the principal symmetry directions. The quartic anharmonic force constant needed for the calculation of the poles in the two-phonon Green's function has been evaluated without making the usual approximations (i.e., Peierls or leading-term approximation). The results indicate that for temperatures above some critical value, the formation of two-phonon bound states is possible for all rare-gas crystals.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:55980
Deposited On:22 Aug 2011 12:56
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