Effective Hamiltonian Approach to Open Systems and Its Applications
  By using the effective Hamiltonian approach, we present a self-consistent framework for the analysis of geometric phases and dynamically stable decoherence-free subspaces in open systems. Comparisons to the earlier works are made. This effective Hamiltonian approach is then extended to a non-Markovian case with the generalized Lindblad master equation. Based on this extended effective Hamiltonian approach, the non-Markovian master equation describing a dissipative two-level system is solved, an adiabatic evolution is defined and the corresponding adiabatic condition is given. 
X. L. Huang, X. X. Yi, Chunfeng Wu, X. L. Feng, S. X. Yu, and C. H. OH