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Magnetic field tuning of charge and spin order in the cuprate superconductors
Anatoli Polkovnikov, Subir Sachdev, Matthias Vojta +1
Recent neutron scattering, nuclear magnetic resonance, and scanning tunneling microscopy experiments have yielded valuable new information on the interplay between charge and spin…
A fractional-spin phase in the power-law Kondo model
Matthias Vojta, Ralf Bulla
We consider a Kondo impurity coupled to a fermionic host with a power-law density of states near the Fermi level, rho(epsilon) ~ |epsilon|^r, with exponent r<0. Using both perturba…
Kondo effect of impurity moments in d-wave superconductors: Quantum phase transition and spectral properties
Matthias Vojta, Ralf Bulla
We discuss the dynamics of magnetic moments in d-wave superconductors, in particular we focus on moments induced by doping non-magnetic impurities into cuprates. The interaction of…
Magnetic properties and spin waves of bilayer magnets in a uniform field
Torsten Sommer, Matthias Vojta, Klaus W. Becker
The two-layer square lattice quantum antiferromagnet with spins 1/2 shows a zero-field magnetic order-disorder transition at a critical ratio of the inter-plane to intra-plane coup…
Multichannel pseudogap Kondo model: Large-N solution and quantum-critical dynamics
Matthias Vojta
We discuss a multichannel SU(N) Kondo model which displays non-trivial zero-temperature phase transitions due to a conduction electron density of states vanishing with a power law…