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Impurity Quantum Phase Transitions
Matthias Vojta
We review recent work on continuous quantum phase transitions in impurity models, both with fermionic and bosonic baths - these transitions are interesting realizations of boundary…
Spontaneous interlayer coherence in bilayer Kondo systems
T. Senthil, Matthias Vojta
Bilayer Kondo systems present interesting models to illustrate the competition between the Kondo effect and intermoment exchange. Such bilayers can exhibit two sharply distinct Fer…
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…
Phenomenological lattice model for dynamic spin and charge fluctuations in the cuprates
Matthias Vojta, Subir Sachdev
Motivated by recent neutron scattering experiments on the cuprate superconductors, we present a phenomenological framework describing the dynamics of collective spin excitations co…
Phase transitions in the pseudogap Anderson and Kondo models: Critical dimensions, renormalization group, and local-moment criticality
Lars Fritz, Matthias Vojta
The pseudogap Kondo problem, describing quantum impurities coupled to fermionic quasiparticles with a pseudogap density of states, rho(omega) ~ |omega|^r, shows a rich zero-tempera…
Impact of disorder on unconventional superconductors with competing ground states
Serge Florens, Matthias Vojta
Non-magnetic impurities are known as strong pair breakers in superconductors with pure d-wave pairing symmetry. Here we discuss d-wave states under the combined influence of impuri…