https://doi.org/10.1007/s100510170339
The lifetime of the soliton in the improved Davydov model at the biological temperature 300 K for protein molecules
Institute of High-energy Electronics, University of Electronic Science and Technology of Chengdu 610054, PR China
and
International Center for Material Physics, Chinese Academy of Sciences, Shenyang 110015, PR China
and
Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany
and
Chinese Center of Advanced Science and Technology (World Lab.) PO Box 8730, Beijing 100080, PR China
Corresponding author: a pangxf@mail.sc.cninfo.net.
Received:
7
January
1999
Revised:
16
August
2000
Published online: 15 January 2001
We study the effects of quantum fluctuations and thermal perturbations on the lifetime of
the
soliton in the improved Davydov model proposed by us with two-quanta and with an added
interaction. By using quantum perturbation theory, we compute the soliton lifetime for a wide
ranges of parameter values relevant for protein molecules. The lifetime of the new soliton at
the biological temperature 300 K is of the order of 10-10 second or 
for
parameters
appropriate to α-helical protein molecules. This shows clearly that the new soliton in the
improved model is a viable mechanism for the bio-energy transport in the α-helix region of
proteins.
PACS: 87.15.He – Dynamics and conformational changes / 31.50.+w – Excited states / 36.20.-r – Macromolecules and polymer molecules / 65.20.+w – Heat capacities of liquids
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
