Flow equation renormalization of a spin-boson model with a structured bath
arXiv:cond-mat/0302357 · doi:10.1016/S1386-9477(02)01083-4
Abstract
We discuss the dynamics of a spin coupled to a damped harmonic oscillator. This system can be mapped to a spin-boson model with a structured bath, i.e. the spectral function of the bath has a resonance peak. We diagonalize the model by means of infinitesimal unitary transformations (flow equations), thereby decoupling the small quantum system from its environment, and calculate spin-spin correlation functions.
2 pages, to be published in Physica E, proceedings of the LT 2002