Anharmonic decay of g-process longitudinal optical phonons in silicon

Z. Aksamija, U. Ravaioli

Research output: Contribution to journalArticlepeer-review


We study phonons produced by transitions between the equivalent X valleys in silicon. We use the Monte Carlo method first to select stochastically the time between phonon collisions, and then to select a final-state pair of phonons from the probability distribution for anharmonic decay. Our results show that g-process phonons decay into one near-equilibrium transverse acoustic phonon and another intermediate longitudinal phonon either on the acoustic or optical branch. This second phonon has energies between 40 and 50 meV and undergoes further decay before turning into a pair of near-equilibrium transverse acoustic phonons, presenting a potential additional bottleneck.

Original languageEnglish (US)
Article number091911
JournalApplied Physics Letters
Issue number9
StatePublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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