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Barrier crossing of a semiflexible ring polymer

Title
Barrier crossing of a semiflexible ring polymer
Authors
Lee, KSung, W
Ewha Authors
이공주복
SCOPUS Author ID
이공주복scopus
Issue Date
2001
Journal Title
PHYSICAL REVIEW E
ISSN
1063-651XJCR Link
Citation
vol. 64, no. 4
Publisher
AMERICAN PHYSICAL SOC
Indexed
SCOPUS WOS scopus
Abstract
\Motivated by the dynamics of a membrane in response to an external force, we study the thermally activated crossing of a semiflexible ring polymer over a potential barrier. For the bistable potential of Kramers type smoothly varying over a long length scale, we calculate the crossing rate using the multidimensional Kramers' rate theory and the functional integral method. We find that, due to its conformational fluctuation, the rate for a flexible ring is much larger than that for a stiff ring. For a sufficiently long chain length or a sufficiently weak bending modulus, the ring undergoes a compact-stretch transition. The stretched conformation of the chain results in a decrease of the activation energy and so the further increase of the rate. This result implies that the soft matter conformational flexibility and adaptability facilitate the barrier crossing.
DOI
10.1103/PhysRevE.64.041801
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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