Ruprecht-Karls-Universität Heidelberg
University of HeidelbergFaculty of Physics and AstronomyInstitut of Theoretical PhysicsAndreas MielkeAndreas Mielkeemail

Andreas Mielke
Institut for Theoretical Physics
Ruprecht-Karls University
Philosophenweg 19
D-69120 Heidelberg
Tel.: ++49 6221 549431 (Secretary)
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Stefan Kehrein, Andreas Mielke: On the spin-boson model with a sub-Ohmic bath
Phys. Lett. A219, 313-318 (1996) .

Archiv: cond-mat/9602022


We study the spin-boson model with a sub-Ohmic bath using infinitesimal unitary transformations. Contrary to some results reported in the literature we find a zero temperature transition from an untrapped state for small coupling to a trapped state for strong coupling. We obtain an explicit expression for the renormalized level spacing as a function of the bare parameters of the system. Furthermore we show that typical dynamical equilibrium correlation functions exhibit an algebaric decay at zero temperature.


author="Stefan Kehrein, Andreas Mielke",
title="On the spin-boson model with a sub-Ohmic bath",
journal="Phys. Lett. A",

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