Nonexponential decay in the quantum dynamics of nanosystems |
| |
Authors: | V A Benderskii E I Kats |
| |
Institution: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia;(2) Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia;(3) Institut Laue-Langevin, 6 rue J. Horowitz, BP 156, F-38042 Grenoble, Cedex 9, France |
| |
Abstract: | The quantum dynamical problem is solved for a system coupled to an equidistant-spectrum bath with the energy difference Ω between the neighboring levels n and n + 1 and the coupling matrix elements C n 2 = C 2(1 + Δ?2 n 2)?1 constraining the energy interval comprising the bath states interacting with the system. The evolution in the strong-coupling limit is determined by two parameters, Γ = πC 2/Ω ? 1 and α = Γ/Δ. If α ≠ 0, then the decrease in the population in the initial cycle with a period of 2π/Ω is not exponential and the effective rate constant increases with time. The results qualitatively explain the appearance of nonexponential relaxation regimes for a dense-spectrum nanosystem and predict the possibility of the multiple recovery of the initial-state population. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|