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Competition between Kondo and Kitaev Physics in Kitaev clusters coupled to a fermionic bath
Tathagata Chowdhury, Achim Rosch, Ralf Bulla
Geometrically frustrated quantum impurities coupled to metallic leads have been shown to exhibit rich behavior with a quantum phase transition separating Kondo screened and local m…
Critical quasiparticles in single-impurity and lattice Kondo models
Matthias Vojta, Ralf Bulla, Peter Wölfle
Quantum criticality in systems of local moments interacting with itinerant electrons has become an important and diverse field of research. Here we review recent results which conc…
The numerical renormalization group method for quantum impurity systems
Ralf Bulla, Theo Costi, Thomas Pruschke
In the beginning of the 1970's, Wilson developed the concept of a fully non-perturbative renormalization group transformation. Applied to the Kondo problem, this numerical renormal…
Zero-Temperature Magnetic Transition in an Easy-Axis Kondo Lattice Model
Jian-Xin Zhu, Stefan Kirchner, Ralf Bulla +1
We address the quantum transition of a spin-1/2 antiferromagnetic Kondo lattice model with an easy-axis anisotropy using the extended dynamical mean field theory. We derive results…
Dissipative Exciton Transfer in Donor-Bridge-Acceptor Systems: Numerical Renormalization Group Calculation of Equilibrium Properties
Sabine Tornow, Ning-Hua Tong, Ralf Bulla
We present a detailed model study of exciton transfer processes in donor-bridge-acceptor (DBA) systems. Using a model which includes the intermolecular Coulomb interaction and the…
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-…