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Kondo volume collapse, Kondo breakdown, and Fermi surface transitions in heavy-fermion metals
Andreas Hackl, Matthias Vojta
The unconventional critical behavior near magnetic quantum phase transitions in various heavy-fermion metals, apparently inconsistent with the standard spin-density-wave scenario,…
Heavy-fermion metals with hybridization nodes: Unconventional Fermi liquids and competing phases
Heidrun Weber, Matthias Vojta
Microscopic models for heavy-fermion materials often assume a local, i.e., momentum-independent, hybridization between the conduction band and the local-moment f electrons. Motivat…
Superconducting d-wave stripes in cuprates: Valence bond order coexisting with nodal quasiparticles
Matthias Vojta, Oliver Rösch
We point out that unidirectional bond-centered charge-density-wave states in cuprates involve electronic order in both s- and d-wave channels, with non-local Coulomb repulsion supp…
Quantum phase transitions in a resonant-level model with dissipation: Renormalization-group studies
Chung-Hou Chung, Matthew T. Glossop, Lars Fritz +3
We study a spinless level that hybridizes with a fermionic band and is also coupled via its charge to a dissipative bosonic bath. We consider the general case of a power-law hybrid…
Reduced dimensionality in layered quantum dimer magnets: Frustration vs. inhomogeneous condensates
Oliver Rösch, Matthias Vojta
Motivated by recent experiments on BaCuSi2O6, we investigate magnetic excitations and quantum phase transitions of layered dimer magnets with inter-layer frustration. We consider t…
Boundary quantum criticality in models of magnetic impurities coupled to bosonic baths
Serge Florens, Lars Fritz, Matthias Vojta
We investigate quantum impurity problems, where a local magnetic moment is coupled to the spin density of a bosonic environment, leading to bosonic versions of the standard Kondo a…