Diagonalization of system plus environment Hamiltonians

Abstract

A new approach to dissipative quantum systems modelled by a system plus environment Hamiltonian is presented. Using a continuous sequence of infinitesimal unitary transformations the small quantum system is decoupled from its thermodynamically large environment. Dissipation enters through the observation that system observables generically decay completely into a different structure when the Hamiltonian is transformed into diagonal form. The method is particularly suited for studying low-temperature properties. This is demonstrated explicitly for the super-Ohmic spin-boson model.

4 pages, Latex, uses Revtex

References in corpus (2)

• Equilibrium dynamics of the dissipative two-state system
• Low temperature equilibrium correlation functions in dissipative quantum systems

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