2003/10/15 by Vincent Pouthier, Vincent J. C. Pouthier, Cyril Falvo
Chemistry · Physics and Astronomy · #Anharmonicity #Biology #Bound state #Chemistry #Condensed matter physics #Molecular physics #Nonlinear Photonic Systems #Phonon #Physics #Polaron #Quantum mechanics #Quantum, superfluid, helium dynamics #Relaxation (psychology) #Spectroscopy and Quantum Chemical Studies #physics.bio-ph
paper · pdf · doi:10.1103/physreve.69.041906
octobre 2003 - soumis Phys. Rev. E
arxiv created 2003/10/15 · openalex publication_date 2004/04/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Relaxation channels for two-vibron bound states in an anharmonic alpha-helix protein are studied. According to a recently established small polaron model [V. Pouthier, Phys. Rev. E 68, 021909 (2003)], it is shown that the relaxation originates in the interaction between the dressed anharmonic vibrons and the remaining phonons. This interaction is responsible for the occurrence of transitions between two-vibron eigenstates mediated by both phonon absorption and phonon emission. At biological temperature, the relaxation rate does not significantly depend on the nature of the two-vibron states involved in the process. The lifetime for both bound and free states is of the same order of magnitude and ranges between 0.1 and 1.0 ps for realistic parameter values. By contrast, the relaxation channels strongly depend on the nature of the two-vibron states which is a consequence of the breatherlike behavior of the two-vibron bound states.