271 citations · 411 across the 7 of their papers we have counts for
7 papers
Numerical Renormalization Group for Impurity Quantum Phase Transitions: Structure of Critical Fixed Points
Hyun-Jung Lee, Ralf Bulla, Matthias Vojta
The numerical renormalization group method is used to investigate zero temperature phase transitions in quantum impurity systems, in particular in the particle-hole symmetric soft-…
Electron Transfer in Donor-Acceptor Systems: Many-Particle Effects and Influence of Electronic Correlations
Sabine Tornow, Ning-Hua Tong, Ralf Bulla
We investigate electron transfer processes in donor-acceptor systems with a coupling of the electronic degrees of freedom to a common bosonic bath. The model allows to study many-p…
Dynamical Mean-Field Theory - from Quantum Impurity Physics to Lattice Problems
Ralf Bulla
Since the first investigation of the Hubbard model in the limit of infinite dimensions by Metzner and Vollhardt, dynamical mean-field theory (DMFT) has become a very powerful tool…
Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
J. Martinek, M. Sindel, L. Borda +6
The effect of a gate voltage () on the spin-splitting of an electronic level in a quantum dot (QD) attached to ferromagnetic leads is studied in the Kondo regime using a gener…
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…
Quantum Phase Transitions in Models of Magnetic Impurities
R. Bulla, M. Vojta
Zero temperature phase transitions not only occur in the bulk of quantum systems, but also at boundaries or impurities. We review recent work on quantum phase transitions in impuri…