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Equilibrium and non-equilibrium dynamics of the sub-ohmic spin-boson model
Frithjof B. Anders, Ralf Bulla, Matthias Vojta
Employing the non-perturbative numerical renormalization group method, we study the dynamics of the spin-boson model, which describes a two-level system coupled to a bosonic bath w…
Quantum phase transitions in the sub-ohmic spin-boson model: Failure of the quantum-classical mapping
Matthias Vojta, Ning-Hua Tong, Ralf Bulla
The effective theories for many quantum phase transitions can be mapped onto those of classical transitions. Here we show that such a mapping fails for the sub-ohmic spin-boson mod…
Numerical Renormalization Group for Bosonic Systems and Application to the Subohmic Spin-Boson Model
Ralf Bulla, Ning-Hua Tong, Matthias Vojta
We describe the generalization of Wilson's Numerical Renormalization Group method to quantum impurity models with a bosonic bath, providing a general non-perturbative approach to b…