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Abstract
We investigate the influence of spinorbit coupling λ in stronglycorrelated multiorbital systems that we describe by a threeorbital HubbardKanamori model on a Bethe lattice. We solve the problem at all integer fillings N with the dynamical meanfield theory using the continuoustime hybridization expansion Monte Carlo solver. We investigate how the quasiparticle renormalization Z varies with the strength of spinorbit coupling. The behavior can be understood for all fillings except N=2 in terms of the atomic Hamiltonian (the atomic charge gap) and the polarization in the j basis due to spinorbit induced changes of orbital degeneracies and the associated kinetic energy. At N=2, λ increases Z at small U but suppresses it at large U, thus eliminating the characteristic Hund's metal tail in Z(U). We also compare the effects of the spinorbit coupling to the effects of a tetragonal crystal field. Although this crystal field also lifts the orbital degeneracy, its effects are different, which can be understood in terms of the different form of the interaction Hamiltonian expressed in the respective diagonal singleparticle basis.
Original language  English 

Article number  205128 
Number of pages  14 
Journal  Physical Review B 
Volume  98 
Issue number  205128 
DOIs  
Publication status  Published  16 Nov 2018 
Fields of Expertise
 Advanced Materials Science
Treatment code (Nähere Zuordnung)
 Basic  Fundamental (Grundlagenforschung)
 Theoretical
Cooperations
 NAWI Graz
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 1 Finished

FWF  TOPOMAT  Topological states of matter from first principles
1/11/14 → 31/10/22
Project: Research project