RESONANCE IN PHONON-PHONON SCATTERING
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
The scattering process, two phonons -- two phonons, is examined in perturbation theory. One of the contributions of second order in the cubic anharmonic potential gives rise to an energy denominator that can vanish. This difficulty is removed by noting that the intermediate phonon has a complex self- energy associated with its instability in the presence of anharmonic forces. Approximating the irreducible self-energy by its lowest-order contribution, one finds a Breit-Wigner form of width equal to the decay rate, one phonon -- 2 phonons, calculated to lowest order. An experiment is proposed to observe directiy the predieted resonance. (auth)
- Research Organization:
- Cornell Univ., Ithaca, N.Y.
- NSA Number:
- NSA-16-007998
- OSTI ID:
- 4811193
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 125; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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