Wong, W.H.; Lo, C.F. - In: The European Physical Journal B - Condensed Matter and … 6 (1998) 2, pp. 213-223
In the present work we have developed an optimal coupled-cluster approximation, which can take care of both the accuracies of the ground-state energy and the wavefunction estimates, for the ground state of a two-state system coupled to a dispersionless boson bath. This new approach is also able...