271 citations · 505 across the 6 of their papers we have counts for
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cond-mat.stat-mech2004
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…
cond-mat.stat-mech2003★ 271 cited
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…