1. Institute of Physics, Academia Sinica, P.O. Box 603-99, Beijing 100080, china;2. Institute of Theoretical Physics, Academia Sinica, Beijing 100080, China;3. Department of Applied Physics, Tianjin University, Tianjin 300072, China
Abstract:
We study the thermodynamic properties of α-helix protein on the basis of Davydov theory. The Hamiltonian of Davydov theory can be represented as a form of pairing Hamiltonian in the momentum space. We prove that the quasi-classical Davydov theory is essentially a theory with Bose condensation no matter whether the molecular excitations are treated as fermions or bosons. The transition temperature of superconductivity theory gives the existence condition of the Davydov soliton.