The vibron dressing in α-helicoidal macromolecular chains

doi:10.1088/1674-1056/22/6/060501

Abstract We present a study of the physical properties of the vibrational excitation in α-helicoidal macromolecular chains, caused by the interaction with acoustical and optical phonon modes. The influence of the temperature and the basic system parameters on the vibron dressing has been analyzed by employing the simple mean-field approach based on the variational extension of the Lang-Firsov unitary transformation. Applied approach predicts a region in system parameter space where one takes place an abrupt transition from partially dressed (light and mobile) to fully dressed (immobile) vibron states. We found that the boundary of this region depends on system temperature and type of bond among structural elements in the macromolecular chain.

Keywords: vibron small-polaron α-helix partial dressing

Received: 01 November 2012
Revised: 28 December 2012
Accepted manuscript online:

PACS:	05.30.-d	(Quantum statistical mechanics)
	31.15.xt	(Variational techniques)
	63.20.kk	(Phonon interactions with other quasiparticles)
	66.30.hp	(Molecular crystals)

Fund: Project supported by the Science Fund of the Ministry of Education and Science of Republic of Serbia (Grant Nos. III-45005 and III-45010) and by the Project within the Cooperation Agreement between the JINR, Dubna, Russian Federation and Ministry of Education and Science of Republic of Serbia.

Corresponding Authors: D. Čevizović
E-mail: cevizd@vinca.rs

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D. Čevizović, S. Galović, A. Reshetnyak, Z. Ivić The vibron dressing in α-helicoidal macromolecular chains 2013 Chin. Phys. B 22 060501

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