Phys. Rev. B 57, 3402 - 3405 (1998)Intrinsic resonant modes for a one-dimensional lattice with a soft optic mode |
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S. A. Kiselev *, R. Lai, and A. J. Sievers
Laboratory of Atomic and Solid State Physics and the Materials Science Center, Cornell University, Ithaca, New York 14853-2501
Received 29 August 1997
Localization of lattice vibrations is investigated for a soft zone-center optic mode overlapping the acoustic spectrum of an anharmonic one-dimensional diatomic lattice. An intrinsic resonant mode is found below the plane-wave optic spectrum. Using numerical methods the frequency and eigenvector of the intrinsic resonant mode has been measured as a function of its amplitude and the optic-mode frequency. Molecular-dynamics simulations show that these localized modes are stable.
©1998 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v57/p3402
DOI: 10.1103/PhysRevB.57.3402
PACS: 63.20.Ry, 63.90.+t
* Permanent address: Institute of Spectroscopy of Russian Academy of Sciences, Troitsk, Moscow 142092.
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