Phys. Rev. B 45, 10344 - 10347 (1992)Numerical measurements of the shape and dispersion relation for moving one-dimensional anharmonic localized modes |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1974: |
S. R. Bickham and A. J. Sievers
Laboratory of Atomic and Solid State Physics and Materials Science Center, Cornell University, Ithaca, New York 14853-2501
S. Takeno
Department of Physics, Faculty of Engineering and Design, Kyoto Institute of Technology, Kyoto, Japan
Received 26 November 1991
Computer simulations show that in a one-dimensional lattice both even and odd anharmonic localized modes can move with constant velocity. For nearest-neighbor forces described by a harmonic plus hard quartic potential, the dispersion relation ω(k) has been calculated for both types of modes. Numerical experiments show that, in general, moving modes with a near-Gaussian excitation envelope occur in parts of ω(k) space, with this region becoming more restricted as the local-mode frequency increases.
©1992 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v45/p10344
DOI: 10.1103/PhysRevB.45.10344
PACS: 63.20.Ry, 63.20.Mt, 63.20.Pw, 67.80.Mg
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