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Title: Interaction of a discrete breather with a lattice junction
Author: Bena, Ioana
Saxena, A. (Avadh)
Sancho, José M.
Keywords: Dinàmica reticular
Física mèdica
Lattice dynamics
Medical physics
Issue Date: 2002
Publisher: The American Physical Society
Abstract: We study the scattering of a moving discrete breather (DB) on a junction in a Fermi-Pasta-Ulam chain consisting of two segments with different masses of the particles. We consider four distinct cases: (i) a light-heavy (abrupt) junction in which the DB impinges on the junction from the segment with lighter mass, (ii) a heavy-light junction, (iii) an up mass ramp in which the mass in the heavier segment increases continuously as one moves away from the junction point, and (iv) a down mass ramp. Depending on the mass difference and DB characteristics (frequency and velocity), the DB can either reflect from, or transmit through, or get trapped at the junction or on the ramp. For the heavy-light junction, the DB can even split at the junction into a reflected and a transmitted DB. The latter is found to subsequently split into two or more DBs. For the down mass ramp the DB gets accelerated in several stages, with accompanying radiation (phonons). These results are rationalized by calculating the Peierls-Nabarro barrier for the various cases. We also point out implications of our results in realistic situations such as electron-phonon coupled chains.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2002, vol. 66, núm. 3, p. 036617(1)-036617(13)
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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