Theory of correlated electrons

Quantum entanglement of spin, orbital and charge degrees of freedom of correlated electrons in oxides is the main topic of our interest. As members of the experimental department, we are strongly motivated by the exciting discoveries made in the lab and try to understand them in terms of many-body theories. Prediction of novel electronic phases in oxides and their interfaces/heterostructures is the main goal of our joint work within Keimer's department as well as with the members of Metzner's and Andersen's theory departments.

Recent Publications Spin-state crossover model for the magnetism of iron pnictides J. Chaloupka, G. Khaliullin.  Phys. Rev. Lett. 110 (2013) 207205 Exploring spin-orbital models with dipolar fermions in zigzag optical lattices G. Sun, G. Jackeli, L. Santos, T. Vekua. Phys. Rev. B 86 (2012) 155159 Zigzag Magnetic Order in the Iridium Oxide Na2IrO3 J. Chaloupka, G. Jackeli, G. Khaliullin.  Phys. Rev. Lett. 110 (2013) 097204 Large spin-wave energy gap for the bilayer iridate Sr3Ir2O7: Evidence for enhanced dipolar interactions near the Mott metal-insulator transition J. Kim, A. H. Said, D. Casa, M. H. Upton, T. Gog, M. Daghofer, G. Jackeli, J. van den Brink, G. Khaliullin, B. J. Kim. Phys. Rev. Lett. 109 (2012), 157402 Magnetic excitation spectra of Sr2IrO4 probed by resonant inelastic x-ray scattering: Establishing links to cuprate superconductors J. Kim, D. Casa, M. H. Upton, T. Gog, Y.-J. Kim, J. F. Mitchell, M. van Veenendaal, M. Daghofer, J. van den Brink, G. Khaliullin, B. J. Kim. Phys. Rev. Lett. 108 (2012), 177003 Disorder induced transition between s+− and s++ states in two-band superconductors D. V. Efremov, M. M. Korshunov, O. V. Dolgov, A. A. Golubov, P. J. Hirschfeld. Phys. Rev. B 84 (2011), 180512(R) Effects of spin vacancies on magnetic properties of the Kitaev-Heisenberg model F. Trousselet, G. Khaliullin, and P. Horsch. Phys. Rev. B 84 (2011), 054409 Spin-orbital resonating valence bond liquid on a triangular lattice: Evidence from finite-cluster diagonalization J. Chaloupka and A. M. Oleś. Phys. Rev. B 83 (2011), 094406 Full list of publications...