6533b830fe1ef96bd1297d40
RESEARCH PRODUCT
Orbital-selective Mott transitions in a doped two-band Hubbard model with crystal field splitting
Peter Van DongenN. BlümerEberhard Jakobisubject
PhysicsField (physics)Hubbard modelCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Quantum Monte CarloFOS: Physical sciencesCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCrystalCondensed Matter - Strongly Correlated ElectronsCrystal field theoryStrongly correlated materialCondensed Matter::Strongly Correlated ElectronsSpin (physics)Phase diagramdescription
We investigate the effects of crystal field splitting in a doped two-band Hubbard model with different bandwidths within dynamical mean-field theory (DMFT), using a quantum Monte Carlo impurity solver. In addition to an orbital-selective Mott phase (OSMP) of the narrow band, which is adiabatically connected with the well-studied OSMP in the half-filled case without crystal field splitting, we find, for sufficiently strong interaction and a suitable crystal field, also an OSMP of the wide band. We establish the phase diagram (in the absence of magnetic or orbital order) at moderate doping as a function of interaction strength and crystal field splitting and show that also the wide-band OSMP is associated with non-Fermi-liquid behavior in the case of Ising type Hund rule couplings. Our numerical results are supplemented by analytical strong-coupling studies of spin order and spectral functions at integer filling.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-01-30 |