DSpace
 

RRI Digital Repository >
07. Theoretical Physics >
Research Papers (TP) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1194

Title: Inequivalence of statistical ensembles in single molecule measurements
Authors: Sinha, Supurna
Samuel, J.
Issue Date: 24-Feb-2005
Publisher: The American Physical Society
Citation: Physical Review E, 2005, Vol.71, 021104
Abstract: We study the role of fluctuations in single molecule experimental measurements of force-extension (f-zeta) curves. We use the wormlike chain (WLC) model to bring out the connection between the Helmholtz ensemble characterized by the free energy [F(zeta)] and the Gibbs ensemble characterized by the free energy [G(f)]. We consider the rigid rod limit of the WLC model as an instructive special case to bring out the issue of ensemble inequivalence. We point out the need for taking into account the free energy of transition when one goes from one ensemble to another. We also comment on the "phase transition" noticed in an isometric setup for semiflexible polymers and propose a realization of its thermodynamic limit. We present general arguments which rule out nonmonotonic force-extension curves in some ensembles and note that these do not apply to the isometric ensemble.
URI: http://hdl.handle.net/2289/1194
ISSN: 1539-3755
1550-2376 (online)
Alternative Location: http://link.aps.org/abstract/PRE/v71/e021104
Copyright: (2005) by the American Physical Society
Appears in Collections:Research Papers (TP)

Files in This Item:

File Description SizeFormat
2005 PRE 71 p021104.pdf5p.56.88 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace