Phys. Rev. Lett. 88, 215502 (2002) [4 pages]Anomalous LO Phonon Lifetime in AlAsReceived 20 November 2001; published 14 May 2002 The temperature dependence of the frequencies and linewidths of the Raman-active longitudinal optical (LO) phonons in GaAs and AlAs have been measured. The low-temperature lifetime of the LO phonon in AlAs is found to be 9.7 ps, very close to the corresponding GaAs value of 9.5 ps. This contradicts early theoretical predictions. The agreement between theory and experiment can be restored when the accidental degeneracy between the AlAs LO phonon frequency and a feature in the two-phonon density of states is taken into account. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.215502
DOI:
10.1103/PhysRevLett.88.215502
PACS:
63.20.Kr, 78.30.Fs
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.