Two-phonon bound states

Morrel H. Cohen, J. Ruvalds

Research output: Contribution to journalArticlepeer-review

107 Scopus citations


A sharp peak in the two-phonon Raman spectrum of diamond was first observed by Krishnan and has recently been shown to be at a frequency higher than twice the maximum single-phonon frequency by Solid and Ramdas. We interpret this peak as evidence for the existence of bound states of the two-phonon system. The repulsive anharmonic phonon-phonon interaction which splits the bound states off the two-phonon continuum is estimated for diamond.

Original languageEnglish (US)
Pages (from-to)1378-1381
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - 1969
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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