In: Physical Review B, 2019, vol. 99, no. 8, p. 085131
We study ordered phases with broken translational symmetry in the halffilled three orbital Hubbard model with antiferromagnetic Hund coupling by means of dynamical meanfield theory (DMFT) and continuoustime quantum Monte Carlo simulations. The stability regions of the antiferroorbital (AFO), antiferromagnetic (AFM), and charge density wave (CDW) states are determined by measuring the...

In: EPL (Europhysics Letters), 2018, vol. 124, no. 5, p. 57002
Spinfreezing is the origin of badmetal physics and nonFermi liquid (nonFL) properties in a broad range of correlated compounds. In a multiorbital lattice system with Hund coupling, doping of the halffilled Mott insulator results in a highly incoherent metal with frozen magnetic moments. These moments fluctuate and collapse in a crossover region that is characterized by unusual nonFermi...

In: Physical Review B, 2018, vol. 98, no. 23, p. 235120
We study a threeorbital Hubbard model with negative Hund's coupling in infinite dimensions, combining dynamical meanfield theory with continuous time quantum Monte Carlo simulations. This model, which is relevant for the description of alkali doped fullerides, has previously been shown to exhibit a spontaneous orbitalselective Mott phase in the vicinity of the superconducting phase....

In: Physical Review B, 2018, vol. 97, no. 16, p. 165119
Local spin fluctuations provide the glue for orbitalsinglet spintriplet pairing in the doped Mott insulating regime of multiorbital Hubbard models. At large Hubbard repulsion U, the pairing susceptibility is nevertheless tiny because the pairing interaction cannot overcome the suppression of charge fluctuations. Using nonequilibrium dynamical mean field simulations of the twoorbital...

In: Physical Review B, 2017, vol. 95, no. 19, p. 195405
We study the controlled manipulation of the JahnTeller metal state of fulleride compounds using nonequilibrium dynamical meanfield theory. This anomalous metallic state is a spontaneous orbitalselective Mott phase, which is characterized by one metallic and two insulating orbitals. Using protocols based on transiently reduced hopping amplitudes or periodic electric fields, we demonstrate...

In: Physical Review Letters, 2017, vol. 118, no. 17, p. 177002
The alkalidoped fullerides A3C60 are halffilled threeorbital Hubbard systems which exhibit an unconventional superconducting phase next to a Mott insulator. While the pairing is understood to arise from an effectively negative Hund coupling, the highly unusual JahnTeller metal near the Mott transition, featuring both localized and itinerant electrons, has not been understood. This...

In: Physical Review B, 2016, vol. 94, no. 7, p. 075107
We solve the orbitally degenerate twoband Hubbard model within dynamical mean field theory and map out the instabilities to various symmetrybroken phases based on an analysis of the corresponding lattice susceptibilities. Phase diagrams as a function of the Hund coupling parameter J are obtained both for the model with rotationally invariant interaction and for the model with Isingtype...

In: Physical Review B, 2016, vol. 93, no. 15, p. 155161
We study the symmetrybroken phases in two and threeorbital Hubbard models with lifted orbital degeneracy using dynamical meanfield theory. On the technical level, we explain how symmetry relations can be exploited to measure the fourpoint correlation functions needed for the calculation of the lattice susceptibilities. In the halffilled two orbital model with crystalfield splitting, we...

In: Physical Review Letters, 2015, vol. 115, no. 24, p. 247001
Multiorbital Hubbard models are shown to exhibit a spatially isotropic spintriplet superconducting phase, where equalspin electrons in different local orbitals are paired. This superconducting state is stabilized in the spinfreezing crossover regime, where local moments emerge in the metal phase, and the pairing is substantially assisted by spin anisotropy. The phase diagram features a...

In: Physical Review Letters, 2015, vol. 115, no. 15, p. 156401
We study the prototype 5d pyrochlore iridate Y2Ir2O7 from first principles using the local density approximation and dynamical meanfield theory (LDA+DMFT). We map out the phase diagram in the space of temperature, onsite Coulomb repulsion U, and filling. Consistent with experiments, we find that an allin–allout ordered insulating phase is stable for realistic values of U. The trigonal...
