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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…
The pseudogap Fermi-Bose Kondo model
Matthias Vojta, Marijana Kircan
We consider a magnetic impurity coupled to both fermionic quasiparticles with a pseudogap density of states and bosonic spin fluctuations. Using renormalization group and large-N c…
Fractionalized Fermi liquids
T. Senthil, Subir Sachdev, Matthias Vojta
In spatial dimensions d >= 2, Kondo lattice models of conduction and local moment electrons can exhibit a fractionalized, non-magnetic state (FL*) with a Fermi surface of sharp ele…
Soliton Fermi sea in models of Ising-coupled Kondo impurities
Stefan Kehrein, Matthias Vojta
We study a model of Ising-coupled Kondo impurities that can be applied to quantum dots with capacitance coupling, coupled qubits with an incoherent environment, etc. We show that t…
Spin collective mode and quasiparticle contributions to STM spectra of d-wave superconductors with pinning
Anatoli Polkovnikov, Subir Sachdev, Matthias Vojta
We present additional details of the scanning tunneling microscopy (STM) spectra predicted by the model of pinning of dynamic spin collective modes in d-wave superconductor propose…
Superconducting charge-ordered states in cuprates
Matthias Vojta
Motivated by recent neutron scattering and scanning tunneling microscopy (STM) experiments on cuprate superconductors, we discuss charge-ordered states, in particular with two-dime…