Document Detail


Dynamical properties of discrete breathers in curved chains with first and second neighbor interactions.
MedLine Citation:
PMID:  12005868     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We present the study of discrete breather dynamics in curved polymerlike chains consisting of masses connected via nonlinear springs. The polymer chains are one dimensional but not rectilinear and their motion takes place on a plane. After constructing breathers following numerically accurate procedures, we launch them in the chains and investigate properties of their propagation dynamics. We find that breather motion is strongly affected by the presence of curved regions of polymers, while the breathers themselves show a very strong resilience and remarkable stability in the presence of geometrical changes. For chains with strong angular rigidity we find that breathers either pass through bent regions or get reflected while retaining their frequency. Their motion is practically lossless and seems to be determined through local energy conservation. For less rigid chains modeled via second neighbor interactions, we find similarly that chain geometry typically does not destroy the localized breather states but, contrary to the angularly rigid chains, it induces some small but constant energy loss. Furthermore, we find that a curved segment acts as an active gate reflecting or refracting the incident breather and transforming its velocity to a value that depends on the discrete breathers frequency. We analyze the physical reasoning behind these seemingly general breather properties.
Authors:
M Ibañes; J M Sancho; G P Tsironis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2002-03-15
Journal Detail:
Title:  Physical review. E, Statistical, nonlinear, and soft matter physics     Volume:  65     ISSN:  1539-3755     ISO Abbreviation:  Phys Rev E Stat Nonlin Soft Matter Phys     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-05-13     Completed Date:  2002-11-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101136452     Medline TA:  Phys Rev E Stat Nonlin Soft Matter Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  041902     Citation Subset:  IM    
Affiliation:
Department d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain.
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MeSH Terms
Descriptor/Qualifier:
Models, Chemical
Polymers / chemistry
Protein Conformation
Proteins / chemistry*
Thermodynamics*
Chemical
Reg. No./Substance:
0/Polymers; 0/Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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