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Locally critical quantum phase transitions in strongly correlated metals
When a metal undergoes a continuous quantum phase transition, non-Fermi-liquid behaviour arises near the critical point. All the low-energy degrees of freedom induced by quantum criticality are… Expand
Local fluctuations in quantum critical metals
We show that spatially local, yet low-energy, fluctuations can play an essential role in the physics of strongly correlated electron systems tuned to a quantum critical point. A detailed microscopic… Expand
Renormalization-group study of Anderson and Kondo impurities in gapless Fermi systems
dilute magnetic impurities in unconventional ( d- and p-wave! superconductors, ‘‘flux phases’’ of the twodimensional electron gas, and certain zero-gap semiconductors. For the nondegenerate Anderson… Expand
Kondo physics and dissipation: A numerical renormalization-group approach to Bose-Fermi Kondo models
We extend the numerical renormalization-group method to treat Bose-Fermi Kondo models BFKMs describing a local moment coupled both to a conduction band and to a dissipative bosonic bath representing,… Expand
Quantum phase transitions in a charge-coupled Bose-Fermi Anderson model
We study the competition between Kondo physics and dissipation within an Anderson model of a magnetic impurity level that hybridizes with a metallic host and is also coupled, via the impurity charge,… Expand
Kondo screening in a magnetically frustrated nanostructure: exact results on a stable non-fermi-liquid phase.
Triangular symmetry stabilizes a novel non-Fermi-liquid phase in the three-impurity Kondo model with frustrating antiferromagnetic interactions between half-integer impurity spins. The phase arises… Expand
Critical local-moment fluctuations, anomalous exponents, and omega/T scaling in the Kondo problem with a pseudogap.
Experiments in heavy-fermion metals and related theoretical work suggest that critical local-moment fluctuations can play an important role near a zero-temperature phase transition. We study such… Expand
Numerical renormalization-group study of the Bose-Fermi Kondo model.
We extend the numerical renormalization-group method to Bose-Fermi Kondo models (BFKMs), describing a local moment coupled to a conduction band and a dissipative bosonic bath. We apply the method to… Expand
Thermodynamics of the up-up-down phase of theS=12triangular-lattice antiferromagnetCs2CuBr4
Specific heat and the magnetocaloric effect are used to probe the field-induced up-up-down phase of Cs2CuBr4, a quasi-two-dimensional spin-1/2 triangular antiferromagnet with near-maximal… Expand
Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction
We address the phenomenon of critical Kondo destruction in pseudogap Bose-Fermi Anderson and Kondo quantum impurity models. These models describe a localized level coupled both to a fermionic bath… Expand