Analytical approach to the current correlation function in dissipative two-state systems

Abstract

Using the spin-boson model with coupling to Ohmic bath, an analytical approach is developed to study the dynamics of the current correlation function in dissipative two-state systems with the view of understanding the effects of environment and tunneling on the coherent oscillation and the long-time decay of the current correlation function in these systems. An analytic expression of current correlation function is obtained and the results agree very well with that of numerical simulations.

Keywords

dissipative two-state systems, coherent- incoherent transition, current correlation function